Need Wiring Diagram, and Help, for 1987 Truck

renovate7

Member
422
4
16
Location
Florida
I'm still trying to track down my no power to fuel pump problem. Apparently this 1987 is different from earlier trucks. The diagram I have shows the #27 wire from the ignition switch joining with #85 to the air buzzer, #74 to the starter button and #654 to the fuel pump. This truck has 4 wires going to a toggle type starter switch, not 2 wires to a starter button. It also has other wires under the dash that do not show up is my wiring diagram. It also does not have a fuse or fuse holder on top of the fuel pump under the cover, apparently never had one...Does anyone know where the #654 joins with the #27, I assume under the dash...Can anyone confirm that all junctions where 2 wires come together are done with packard/plug type connectors and not 2 wires soldered/joined together inside a wiring harness where the junction is not visible?
 

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renovate7

Member
422
4
16
Location
Florida
That's the wiring diagram I have. It shows the 27 wire coming off terminal B from the master switch and junctioning with 654 to the fuel pump. I can't find that junction.
 

renovate7

Member
422
4
16
Location
Florida
Thought I'd post more info, and a happy ending to this...I forgot I have an NOS front wiring harness on the shelf. I got it out and traced the 654 wire from the pump to the wires that are under the dash. The 654 doesn't re-appear anywhere else on the harness, somewhere in the taped up loom it junctions with the 27. The wiring in this 1987 Deuce is definately different than the fold out diagram in my 20 manual. There are a lot of wires that don't appear in the diagram including the 4 wires to the toggle type starting switch. My NOS harness is in a bag dated 1991 and matches what is in this truck, not the wiring diagram...I decided to run a new wire from under the dash to the fuel pump to get it going again. When I started to cut away the electrical tape aroung the wires at the pump a fuse holder appeared, with a blown 2 amp fuse! Problem solved! Apparently the fuse holder under the cover had gone bad and they had replaced it with an inline holder, not visible under all the tape that had been painted green. I've got 3-4 hours invloved in what has turned out to be a blown fuse. Another learning opportunity.
 

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steelandcanvas

Well-known member
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78
48
Location
Southwestern Idaho
I have an '87 also, an old M35A2C Air Force Deuce. I understand the AF didn't order their trucks with a serparate push button for the starter. The ignition switch had a start position in it, not just off/on. I think this explains the extra wires and wire numbers that are not included in our TM's. I also understand they had trouble with this set up, and went back to the original way the Army and Marines did it. This information is second-hand, but seems plausible. A copy of an Air Force Deuce wiring diagram would prove this to be true or not.
 
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