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Glow plugs, 87 thru 94, new style system

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  #31  
Old 11-30-2009, 04:29 PM
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If the light is on for less than 10 seconds and you are getting a clicking relay you have a problem between the relay and glow plugs or burnt out glow plugs.

On the new style system, glow plug resistance is critical.
.5 to 1 ohm each.
An open circuit, shorted glow plugs or old glow plugs with resistance to high will cause the glow plugs to short cycle or not cycle at all.
  #32  
Old 11-30-2009, 04:34 PM
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Glow plugs, 87 thru 94, new style system

I am going to make it easier for glow plug problems since cold weather is here.
  #33  
Old 12-01-2009, 12:16 AM
tow pro 570 tow pro 570 is offline
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lights on for about 10 sec goes out then you hear the clicking noise -----------and the black heavy wires do they go to the bottom of the resister the (z looking thing ) and no more humming noise ?????? dont know what i did
  #34  
Old 12-01-2009, 05:23 AM
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Heavy black wires are not stock so where they go is anybody's guess.

Tan would be stock wiring color that should be connected to the bottom of the Z thing.
  #35  
Old 12-01-2009, 11:36 AM
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wait dave, only the starter relay has the i and s?
  #36  
Old 12-02-2009, 10:00 PM
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dave my truck is 92 ford 450 i bought it in 2000 never had to change any thing with the glow plugs other than that the harness and controller has never been touched except the glow plugs
  #37  
Old 12-02-2009, 11:55 PM
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branden only the starter relay has the I and S by the small terminals.

towpro, if you bought a 92 truck in 2000, that means someone else had 8 years to change things.

If you read this forum long enough, it is amazing what some people do to vehicle wiring.

I wish I could help more, but trying to figure out a truck problem by typing back and forth sometimes gets to be very frustrating for everyone.

Do you have a volt meter?

Let's try again with a different approach.
First unplug the front electrical connector on the drivers side of the IP.
That is the fuel shut off solenoid, so the engine will not start and the solenoid will not burn up while testing the glow plugs.

Also for these tests, leave the negative lead on the volt meter on the battery negative terminal for all readings.



Key off.
How many volts across the battery?
Now how many volts at the battery terminal of the glow plug relay?

Now key to on.
How many volts across tha battery?
How many volts at the battery terminal?
How many volts at the ignition terminal?

Now make up a short jumper wire.
You are going to check the voltage at the glow plug terminal.
Clips on the volt meter lead may make it easier if you have them.
10 seconds max time for the jumper to be installed on the white wire terminal and a ground connection.

When you have the key on, and ground the white wire terminal, the relay will close.
How many volts on the glow plug terminal?

Jumper wire off the white wire terminal.

Now pull a couple connectors off the glow plugs, one at a time.
Check the voltage at each of the connectors by closing the relay with the jumper wire.
What are those voltages?
  #38  
Old 12-03-2009, 12:43 AM
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i was told by an ex mechanic at napa that these relays that he sells do a dual purpose for these year trucks, this isnt my area of expertise but can he be correct?
  #39  
Old 12-03-2009, 11:27 AM
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The internal electrical connections are different.

Starter relay coil grounds through the mounting bracket, and I don't remember what the gasser motor used the I terminal for, diesels have nothing on that terminal.

The glow plug relay coil is grounded through the second small terminal, not the mounting bracket.

With a wire reconfigure you can make the starter relay work, but it will not work if you just swap them out.

An 86 glow plug relay will swap right on to an 87 or newer controller, repair for 18 dollars versus 150 for a new controller/relay they list for the 7.3 engine.
  #40  
Old 12-09-2009, 11:19 AM
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I got a quick question guys can I use a later model relay on a 1994 F-250 7.3 IDI TURBO i got the price for a new GP controller from ford it was like $190????
  #41  
Old 12-09-2009, 11:46 AM
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I think all the idi glow plug modules are the same from 1987-1994. dave s listed the part # for the relay that needs to be used or just ask for a GP relay for a 1986 6.9 truck.
  #42  
Old 12-09-2009, 12:28 PM
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Quote:
Originally Posted by FORD !D! TURBO View Post
I got a quick question guys can I use a later model relay on a 1994 F-250 7.3 IDI TURBO i got the price for a new GP controller from ford it was like $190????
Here's a few places to check. Others have recommended but I have no first hand experience with them.

Diesel performance parts and accessories. Diesel injectors, pumps, filters, kits, additive, gauges and apparel.

Pensacola Fuel Injection | Worlds #1 Diesel Rebuilder - Cart contents
  #43  
Old 12-12-2009, 04:11 PM
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I just bought a gpr7 relay from Advence auto and it has an I and S on it. Is this right?
  #44  
Old 12-12-2009, 05:45 PM
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Quote:
Originally Posted by bcarless View Post
I just bought a gpr7 relay from Advence auto and it has an I and S on it. Is this right?
Apparently that's the starter relay not GP relay.
  #45  
Old 12-12-2009, 08:14 PM
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no dude i don't think it will work unless u ground the body of the relay. If u get one for a 1986 6.9 it will work. the pre 87 truck had remote mounted relay. Return it and tell him u want a glow plug relay for a 1986 6.9 diesel
 
 
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