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May 11, 2015 | 06:29 PM

#16

mike L

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Fleet Mechanic

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From: va

Quote:

Originally Posted by subford

Check to see if your clutch jumper is in place.

Bill, what do you mean, I don't have a clutch. I wounder if there's something wrong with the pcm.

May 11, 2015 | 07:20 PM

#17

subford

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From: Easton,Ks

The PCM has nothing to do with the cranking of the engine.
When you do not have a clutch you have a clutch jumper in place of the clutch switch.
The start wire passes through the clutch jumper on it way from the ignition switch to the MLPS.

May 11, 2015 | 11:56 PM

#18

mike L

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From: va

testing clutch jumper for automatic transmition

I ohms checked the cap for the two red/LB wires, it tested ok. I used a test light to back probed the two Red/Lb wires on the clutch jumper for power. The two wires have power while I held the key to the start position.
So far I have power going through the red/lt blue wire at the clutch jumper. Also to ignition switch plug. But not to the MLPS.
Doesn't the Red/lt blue wire runs through the firewall connector, where is it located on the connector? Then run to the MLPS?

May 12, 2015 | 06:56 AM

#19

ng19delta

Senior User

Joined: Mar 2015

Posts: 450

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From: Merchantville, NJ 08109

This is going to sound simple, but if you have ANY play in your tilt wheel column, try lifting up on the steering wheel when you turn the key... I had the same symptom on my 91, and this is what cured it! I am not sure if it is an over extended starter switch linkage or what, but when I lift the wheel, it starts... If I don't, then nothing.

Scott

May 12, 2015 | 06:59 AM

#20

subford

Fleet Owner

Joined: Aug 2005

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Likes: 301

From: Easton,Ks

Quote:

Originally Posted by mike L

Doesn't the Red/lt blue wire runs through the firewall connector, where is it located on the connector?

Yes it does at C202.
Also check to see if you have a Anti-Theft Controller Module that it may pass through on its way to C202. If it does this might be your problem.

Quote:

Originally Posted by mike L

Then run to the MLPS?

No it first goes through C103.

C202:LH rear of engine compartment, in safety wall (A8)
C103: LH side of engine compartment, top of wheel well (F6)
See diagram below:

Note the bottom two images are for a 1994 F-series but yours should be the same.

May 12, 2015 | 08:08 PM

#21

mike L

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From: va

power red/lt bl wire

C202 has power but C103 does not. What does the Anti-Theft Controller Module look like and were is it at ? I can't find it under google.

May 13, 2015 | 07:30 AM

#22

subford

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From: Easton,Ks

Quote:

Originally Posted by mike L

C202 has power but C103 does not. What does the Anti-Theft Controller Module look like and were is it at ? I can't find it under google.

If C202 pin #29 has power then most likely you do not have a Anti-Theft Controller Module as they are ahead of C202 and located in the cab.

There should be just a short wire running between C202 pin #29 and C103 pin #4. If C202 was plugged in and the key in the start position when you checked C103 pin #4 and found no power then you need to unwrap the harness between the two plugs and fix the wire or bridge a wire between C202 pin #29 and C103 pin #4.

May 14, 2015 | 08:31 PM

#23

mike L

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From: va

I checked c103 by piercing the wire before and after the connecter. I couldn't get the connector apart. There was no power.

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May 24, 2015 | 11:50 AM

#24

mike L

Thread Starter

Fleet Mechanic

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From: va

fixed wire problem

I added a jumper between c103 and c202. I have power for the # 32 wire at the MLPS and at the fender starter relay. I hear a click from the fender relay when I try to start the truck. Do I need to replace the fender relay?
Edit: I found that when I wiggled the + wire on the battery, it starts. I'll fix that. Thanks for the help!