Relay Identification..
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Senior User
Joined: Oct 2005
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Relay Identification..
1988 F150 5.0 EFI automatic 4x4
I've been tracking down a power failure in my truck, and I have a couple of questions that I hope someone can answer...
I was in the FordFuelInjection.com site and reading up on the EFI electrical systems for Ford trucks, They show an "Ignition Relay" along side the EEC relay and the Fuelpump relay in their schematic,..I dont see it under my hood. would that relay pertain to my year f150? I dont see it in the Haynes book either..
And...
I noticed that I do have a Relay back in the corner close to the firewall by the Brake booster, and its attached to the upper fender behind the Hood hinge, -its up high and has Lt.grey tape wrapped around the wires, and it is a Relay, But whats it For? anyone know??
-Thanks
I've been tracking down a power failure in my truck, and I have a couple of questions that I hope someone can answer...
I was in the FordFuelInjection.com site and reading up on the EFI electrical systems for Ford trucks, They show an "Ignition Relay" along side the EEC relay and the Fuelpump relay in their schematic,..I dont see it under my hood. would that relay pertain to my year f150? I dont see it in the Haynes book either..
And...
I noticed that I do have a Relay back in the corner close to the firewall by the Brake booster, and its attached to the upper fender behind the Hood hinge, -its up high and has Lt.grey tape wrapped around the wires, and it is a Relay, But whats it For? anyone know??
-Thanks
Senior User
Joined: Jan 2009
Posts: 219
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From: Maricopa, AZ
I'm looking at Autozone.com's component locations:
Autozone doesn't appear to list an EEC Relay, or an Ignition Relay, in the parts for sale for your truck, but they do show an ECM wiring relay (could this be the check engine light relay/eca relay?). Maybe their site will help you make some sense of it.
On your 1988 Ford Truck F150 1/2 ton P/U 4WD 5.0L FI , the Relay - Trailer Lights is located:
Under hood, driver side, rear engine area, mounted on firewall
On your 1988 Ford Truck F150 1/2 ton P/U 4WD 5.0L FI , the Relay - Fuel Pump is located:
Under hood, center, upper engine area, mounted on air cleaner support bracket
On your 1988 Ford Truck F150 1/2 ton P/U 4WD 5.0L FI , the Relay - Check Engine Light is located:
Front seating area, center, under dash, passenger side of center dash brace, mounted on top of Electronic Control Assembly (ECA)
Under hood, driver side, rear engine area, mounted on firewall
On your 1988 Ford Truck F150 1/2 ton P/U 4WD 5.0L FI , the Relay - Fuel Pump is located:
Under hood, center, upper engine area, mounted on air cleaner support bracket
On your 1988 Ford Truck F150 1/2 ton P/U 4WD 5.0L FI , the Relay - Check Engine Light is located:
Front seating area, center, under dash, passenger side of center dash brace, mounted on top of Electronic Control Assembly (ECA)
Thread Starter
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Senior User
Joined: Oct 2005
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I'm looking at Autozone.com's component locations:
Autozone doesn't appear to list an EEC Relay, or an Ignition Relay, in the parts for sale for your truck, but they do show an ECM wiring relay (could this be the check engine light relay/eca relay?). Maybe their site will help you make some sense of it.
Autozone doesn't appear to list an EEC Relay, or an Ignition Relay, in the parts for sale for your truck, but they do show an ECM wiring relay (could this be the check engine light relay/eca relay?). Maybe their site will help you make some sense of it.
-I think your right about that Relay back in the corner being a Trailer light Relay..
I have the Lariat XLT and did find a trailer harness running underneath..
I was kinda hoping it was an "Ignition relay" of sorts...only because I'm looking for an origin of my electric problem..
-Thanks Beastly
Senior User
Joined: Jan 2009
Posts: 219
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From: Maricopa, AZ
This sounds like what is on my '97 F250 drivers-side fenderwell, too. So, I upped the model year, and looked for an '89 F150 4x4 5.0, and here is the ignition relay location according to Autozone's Repair Info -> Component Locations information:
This sounds a little better from your description, doesn't it?
I still don't see it listed in Autozone's parts for sale (unless they are just calling it a multi-purpose relay), but, I do find the EEC Relay, and several others on the partsamerica.com website under Relays -> Misc Relays.
EDIT: Rock Auto shows a bunch of relays, too. And they at least give some Ford part/reference numbers, even though they are listed as Misc relays.
Maybe you are in a situation like I am with my 2002 ZX2. Depending on what part I need, I need to order for a 2002, or a 2003. Ford apparently switched quite a bit of the components to the 2003 version during the 2002 production run. When I need parts, I have to look up both years, and end up ordering both if they are different, and when I'm done, I have to return the one that didn't fit.
I hope this is helpful, and not muddying the waters more.
On your 1989 Ford Truck F150 1/2 ton P/U 4WD 5.0L FI , the Relay - Ignition is located:
Under hood, driver side, front side of wheelwell, mounted in relay block
Application:
MCU
Under hood, driver side, front side of wheelwell, mounted in relay block
Application:
MCU
I still don't see it listed in Autozone's parts for sale (unless they are just calling it a multi-purpose relay), but, I do find the EEC Relay, and several others on the partsamerica.com website under Relays -> Misc Relays.
EDIT: Rock Auto shows a bunch of relays, too. And they at least give some Ford part/reference numbers, even though they are listed as Misc relays.
Maybe you are in a situation like I am with my 2002 ZX2. Depending on what part I need, I need to order for a 2002, or a 2003. Ford apparently switched quite a bit of the components to the 2003 version during the 2002 production run. When I need parts, I have to look up both years, and end up ordering both if they are different, and when I'm done, I have to return the one that didn't fit.
I hope this is helpful, and not muddying the waters more.
Last edited by Beastly; Feb 20, 2009 at 07:52 AM. Reason: Added Rock Auto
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that last description said in front of the wheelwell. The relay I am looking at is behind the wheelwell, right in front of the firewall. It is actually behind the hood hinge on drivers side. I am thinking it probably is a trailer harness relay, I traced one of the wires inside the cab and best I can tell it runs to my trailer brake controller.
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that last description said in front of the wheelwell. The relay I am looking at is behind the wheelwell, right in front of the firewall. It is actually behind the hood hinge on drivers side. I am thinking it probably is a trailer harness relay, I traced one of the wires inside the cab and best I can tell it runs to my trailer brake controller.
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Thread Starter
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Senior User
Joined: Oct 2005
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This sounds like what is on my '97 F250 drivers-side fenderwell, too. So, I upped the model year, and looked for an '89 F150 4x4 5.0, and here is the ignition relay location according to Autozone's Repair Info -> Component Locations information:
This sounds a little better from your description, doesn't it?
I still don't see it listed in Autozone's parts for sale (unless they are just calling it a multi-purpose relay), but, I do find the EEC Relay, and several others on the partsamerica.com website under Relays -> Misc Relays.
EDIT: Rock Auto shows a bunch of relays, too. And they at least give some Ford part/reference numbers, even though they are listed as Misc relays.
Maybe you are in a situation like I am with my 2002 ZX2. Depending on what part I need, I need to order for a 2002, or a 2003. Ford apparently switched quite a bit of the components to the 2003 version during the 2002 production run. When I need parts, I have to look up both years, and end up ordering both if they are different, and when I'm done, I have to return the one that didn't fit.
I hope this is helpful, and not muddying the waters more.
This sounds a little better from your description, doesn't it?
I still don't see it listed in Autozone's parts for sale (unless they are just calling it a multi-purpose relay), but, I do find the EEC Relay, and several others on the partsamerica.com website under Relays -> Misc Relays.
EDIT: Rock Auto shows a bunch of relays, too. And they at least give some Ford part/reference numbers, even though they are listed as Misc relays.
Maybe you are in a situation like I am with my 2002 ZX2. Depending on what part I need, I need to order for a 2002, or a 2003. Ford apparently switched quite a bit of the components to the 2003 version during the 2002 production run. When I need parts, I have to look up both years, and end up ordering both if they are different, and when I'm done, I have to return the one that didn't fit.
I hope this is helpful, and not muddying the waters more.
But I was just trying to find out what I had allready found out- It was a "Trailer Brake Control relay"..I thought it might have been somthing else that concerned the Ignition system..
I guess I'm still learning new things about this old truck after 3 years of ownin it..
-Thanks.
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 790
From: Simi Valley, CA
Look on the relay for the Ford ID number, it's either stamped in black ink, or molded into the part.
Post the ID number here, I'll give you the Ford part number, tell you exactly what it is, what it fits, and the cost.
If there is a Motorcraft part number as well as the Ford part number, any autoparts store can cross it over to the brands they sell.
Post the ID number here, I'll give you the Ford part number, tell you exactly what it is, what it fits, and the cost.
If there is a Motorcraft part number as well as the Ford part number, any autoparts store can cross it over to the brands they sell.
Thread Starter
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Senior User
Joined: Oct 2005
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Look on the relay for the Ford ID number, it's either stamped in black ink, or molded into the part.
Post the ID number here, I'll give you the Ford part number, tell you exactly what it is, what it fits, and the cost.
If there is a Motorcraft part number as well as the Ford part number, any autoparts store can cross it over to the brands they sell.
Post the ID number here, I'll give you the Ford part number, tell you exactly what it is, what it fits, and the cost.
If there is a Motorcraft part number as well as the Ford part number, any autoparts store can cross it over to the brands they sell.
E3AF
12A646
B28
Brown Casing
Black top
E3TB
9345
A2A
Green casing
Black top
***There is one at the rear of the Firewall in close proximity of the Hood Hinge that Has absolutely NO markings on it whatsoever.- The plug end is light Gray in color w/ a black top, -three wire relay..-Again, I believe this to be the Trailer brake control relay..only because I tracked down the wiring..(However, -Ive been wrong b4).
So, do you have any info on a trailer brake control relay?, or maybe a number for an actual "Ignition relay"?? I am curious to know if an "Ignition relay" does exist?
-Thanks
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 790
From: Simi Valley, CA
OK,...I thought I'd take you up on your offer,- Heres a couple of #'s :
E3AF-12A646-B28 / Brown Casing Black top
E3TB-9345-A2A / Green casing Black top
***There is one at the rear of the Firewall in close proximity of the Hood Hinge that Has absolutely NO markings on it whatsoever.- The plug end is light Gray in color w/ a black top, -three wire relay..-Again, I believe this to be the Trailer brake control relay..only because I tracked down the wiring..(However, -Ive been wrong b4).
So, do you have any info on a trailer brake control relay?, or maybe a number for an actual "Ignition relay"?? I am curious to know if an "Ignition relay" does exist?
-Thanks
E3AF-12A646-B28 / Brown Casing Black top
E3TB-9345-A2A / Green casing Black top
***There is one at the rear of the Firewall in close proximity of the Hood Hinge that Has absolutely NO markings on it whatsoever.- The plug end is light Gray in color w/ a black top, -three wire relay..-Again, I believe this to be the Trailer brake control relay..only because I tracked down the wiring..(However, -Ive been wrong b4).
So, do you have any info on a trailer brake control relay?, or maybe a number for an actual "Ignition relay"?? I am curious to know if an "Ignition relay" does exist?
-Thanks
Will be back on later tonight to run down that trailer tow (?) relay.
ID number: E3TB-9345-A2A / Ford part number: E3TZ9345A replaced by F19Z9345A replaced by F8PZ14N135AA .. Fuel Pump Relay (Motorcraft DY864).
MSRP: $21.53 // FTEpartsguy.com price: $11.63.
-----------------------------------------------
ID number: E3AF-12A646-B2B / Ford part number: E3AZ12A646A replaced by F8PZ14N135BA .. EEC Relay Assy. (Motorcraft DY865)
MSRP: $29.36 // FTEpartsguy.com price: $15.85.
As one can see, Ford just loves to update part numbers.
Tryin' to keep track of all this jazz, is a ROYAL PITA!
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I'm only going to decode these two ID numbers at this time. I've been on here since 6AM, and I'm using scratchy microfiche slides, hard to read for an old goat.
Will be back on later tonight to run down that trailer tow (?) relay.
ID number: E3TB-9345-A2A / Ford part number: E3TZ9345A replaced by F19Z9345A replaced by F8PZ14N135AA .. Fuel Pump Relay (Motorcraft DY864).
MSRP: $21.53 // FTEpartsguy.com price: $11.63.
-----------------------------------------------
ID number: E3AF-12A646-B2B / Ford part number: E3AZ12A646A replaced by F8PZ14N135BA .. EEC Relay Assy. (Motorcraft DY865)
MSRP: $29.36 // FTEpartsguy.com price: $15.85.
As one can see, Ford just loves to update part numbers. Tryin' to keep track of all this jazz, is a ROYAL PITA!
Will be back on later tonight to run down that trailer tow (?) relay.
ID number: E3TB-9345-A2A / Ford part number: E3TZ9345A replaced by F19Z9345A replaced by F8PZ14N135AA .. Fuel Pump Relay (Motorcraft DY864).
MSRP: $21.53 // FTEpartsguy.com price: $11.63.
-----------------------------------------------
ID number: E3AF-12A646-B2B / Ford part number: E3AZ12A646A replaced by F8PZ14N135BA .. EEC Relay Assy. (Motorcraft DY865)
MSRP: $29.36 // FTEpartsguy.com price: $15.85.
As one can see, Ford just loves to update part numbers.
Tryin' to keep track of all this jazz, is a ROYAL PITA!
New User
Joined: Feb 2005
Posts: 9
Likes: 1
I have been reading your questions here and it seems I have the same problem other than if I let it sit for 1/2 hour or so it will start. I have changed both the EEC relay and fuel pump relay, replaced all distributer parts with no fix. I like you started to trace wires beginning on paper from my Haynes book. I've narrowed it down to what they call the PCM Power control Module, or the starter relay. Did you ever find your problem? If you did could you help me out. It would be very much appriciated
4wd Low
Joined: Mar 2024
Posts: 12
Likes: 1
hi there , i also have a relay identification search if you can please help i would appreciate your time
need eec relay E3AF 12A646 B2A brown/black
need fuel pump relay F19B 9345 A2A green/black
ford 92-94 F250 XLT CUSTOM 5.8 EFI dual fuel x2 tanks petrol
i look forward to your reply cheers
need eec relay E3AF 12A646 B2A brown/black
need fuel pump relay F19B 9345 A2A green/black
ford 92-94 F250 XLT CUSTOM 5.8 EFI dual fuel x2 tanks petrol
i look forward to your reply cheers