Wiring problem after engine swap.
Thread Starter
|
Modular motor junkie
Joined: May 2009
Posts: 6,190
Likes: 8
From: Texas
Wiring problem after engine swap.
I swaped from a 7.3 to a 6.9 and now I have 2 problems.
The lesser one is that I do not know were the wire for the tach should go.
The bigger problem is that after I had everything other than that fixed I fired it up. It started and ran great, but then when I went to shut it off it would not die. I had to pull the wire off the IP. I tried, but it will not come out of " on ". I can turn the key all the way forward and back, but it stays on.
Its like I am not even moving the key.
EDIT: Post 4,000!!!
The lesser one is that I do not know were the wire for the tach should go.
The bigger problem is that after I had everything other than that fixed I fired it up. It started and ran great, but then when I went to shut it off it would not die. I had to pull the wire off the IP. I tried, but it will not come out of " on ". I can turn the key all the way forward and back, but it stays on.
Its like I am not even moving the key.
EDIT: Post 4,000!!!
Cargo Master
Joined: Feb 2008
Posts: 3,409
Likes: 1
From: back in SE Iowa
not sure about the truck not shutting down but do you by any chance know what vehicle the new(est) motor came from?im thinking it might not have had a tach. but im thinking you can pull parts off the 7.3 to make it work
Postmaster
Joined: Dec 2002
Posts: 3,594
Likes: 2
From: Southern Oregon USA
Here is a thread dealing with ignition wiring. Might be a good place to start.
Did you transfer all of the engine elec components, including the GP controller from the 7.3? When you shut the key off, does anything else stay on? Or just the engine?
https://www.ford-trucks.com/forums/9...on-wiring.html
Jason
Did you transfer all of the engine elec components, including the GP controller from the 7.3? When you shut the key off, does anything else stay on? Or just the engine?
https://www.ford-trucks.com/forums/9...on-wiring.html
Jason
Trending Topics
Thread Starter
|
Modular motor junkie
Joined: May 2009
Posts: 6,190
Likes: 8
From: Texas
I used the 7.3s harnes and GPC.
Every thing stays on, its like I never turned the key.
Thanks for the help.
Every thing stays on, its like I never turned the key.
Thanks for the help.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Top 10 Ford Trucks Coming to Mecum Indy 2026
Brett Foote
5 Best / 5 Worst Ford Truck Wheels of All Time
Joe Kucinski
Ford Super Duty: 5 Things Owners LOVE, 5 Things They LOATHE!
Joe Kucinski
Every 2026 Ford Truck Engine RANKED from WORST to FIRST!
Michael S. Palmer
The Best F-150 Deal of Every Trim Level (XL through Raptor)
Joe Kucinski
Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 15
From: Nutter Fort, WV
As far as the tach sensor, you need to swap IP drive gear covers.
Remove the IP from the drive gear cover.
Now unbolt the drive gear cover and carefully remove it, leaving the IP drive gear meshed with the cam gear.
Now carefully install the IP drive gear cover that was on your old motor with the tach sensor in it.
Thinking about what could have short circuited to put power on the red/green wire to keep the engine running, but right now I am at a loss on that one.
The glow plug controller would be about the best cantidate I can think of right now since it has both battery power and ignition power on two terminals that are beside each other.
Remove the IP from the drive gear cover.
Now unbolt the drive gear cover and carefully remove it, leaving the IP drive gear meshed with the cam gear.
Now carefully install the IP drive gear cover that was on your old motor with the tach sensor in it.
Thinking about what could have short circuited to put power on the red/green wire to keep the engine running, but right now I am at a loss on that one.
The glow plug controller would be about the best cantidate I can think of right now since it has both battery power and ignition power on two terminals that are beside each other.
Lead Driver
Joined: Nov 2003
Posts: 6,900
Likes: 3
From: Campbell River, B.C.
Not 100% sure, but I think the tachometer was only an option for 85 and 86.
I wonder if you got some wires crossed on the injector pump. Could it be you swapped the high idle/timing advance with the FSS connection? The engine would likely turn itself off after about 10 minutes of running if that were the case.
I wonder if you got some wires crossed on the injector pump. Could it be you swapped the high idle/timing advance with the FSS connection? The engine would likely turn itself off after about 10 minutes of running if that were the case.
i ain't rite
Joined: Mar 2005
Posts: 65,426
Likes: 5,507
From: Marlboro Mental Hospital.
if you do not have any crossed wires, i bet the ignition actuator in the top of the column is broke.
on top of the column, down above the brake pedal is the ignition switch. it is held on by 2 bolts, if i remember correctly you need a 7/16 wrench. remove the switch and see if you can start and shut off the truck using a small screwdriver to work the switch. if everything works properly, the actuator is bad.
common problem point on the old body style trucks.
on top of the column, down above the brake pedal is the ignition switch. it is held on by 2 bolts, if i remember correctly you need a 7/16 wrench. remove the switch and see if you can start and shut off the truck using a small screwdriver to work the switch. if everything works properly, the actuator is bad.
common problem point on the old body style trucks.
Thread Starter
|
Modular motor junkie
Joined: May 2009
Posts: 6,190
Likes: 8
From: Texas
I had it running and it shut off ok. It was the second or third start that it did this.
Thread Starter
|
Modular motor junkie
Joined: May 2009
Posts: 6,190
Likes: 8
From: Texas
As far as the tach sensor, you need to swap IP drive gear covers.
Remove the IP from the drive gear cover.
Now unbolt the drive gear cover and carefully remove it, leaving the IP drive gear meshed with the cam gear.
Now carefully install the IP drive gear cover that was on your old motor with the tach sensor in it.
Remove the IP from the drive gear cover.
Now unbolt the drive gear cover and carefully remove it, leaving the IP drive gear meshed with the cam gear.
Now carefully install the IP drive gear cover that was on your old motor with the tach sensor in it.
Thinking about what could have short circuited to put power on the red/green wire to keep the engine running, but right now I am at a loss on that one.
The glow plug controller would be about the best cantidate I can think of right now since it has both battery power and ignition power on two terminals that are beside each other.
The glow plug controller would be about the best cantidate I can think of right now since it has both battery power and ignition power on two terminals that are beside each other.
Thread Starter
|
Modular motor junkie
Joined: May 2009
Posts: 6,190
Likes: 8
From: Texas
if you do not have any crossed wires, i bet the ignition actuator in the top of the column is broke.
on top of the column, down above the brake pedal is the ignition switch. it is held on by 2 bolts, if i remember correctly you need a 7/16 wrench. remove the switch and see if you can start and shut off the truck using a small screwdriver to work the switch. if everything works properly, the actuator is bad.
common problem point on the old body style trucks.
on top of the column, down above the brake pedal is the ignition switch. it is held on by 2 bolts, if i remember correctly you need a 7/16 wrench. remove the switch and see if you can start and shut off the truck using a small screwdriver to work the switch. if everything works properly, the actuator is bad.
common problem point on the old body style trucks.
I'll check it. How much is it and how hard is it to change?
Lead Driver
Joined: Nov 2003
Posts: 6,900
Likes: 3
From: Campbell River, B.C.
If your radio stayed on too, then its definately in your ignition switch or somewhere between the switch and the key cylinder. I can't think of anytihng else that could cause all of that.