wiring harness fire
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wiring harness fire
Before starting they key was in the ON position and wait to start light was working fine, I noticed a large amount of smoke coming from the engine bay and took the key out and popped the hood. The wiring harness on the passengers side was on fire and dripping plastic. I blew it out and didn't try again until the next day with the same results. What wiring harness is this and how would I go about replacing it? I've looked at a few wiring diagrams but am still unsure. Is it the glow plug wiring harness or the engine connector? I'm also a little color blind so that makes it even more fun. Is this harness relatively easy to replace or does everything need to be rewired? I suppose I could disconnect the glow plugs, it would just be really hard to start, and drive it to the shop. What do you think I should do? Thanks, any help is appreciated.
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Joined: Nov 2003
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From: Nutter Fort, WV
All the electric to the motor comes across the passenger side fender well. Probably started with the glow plug harness, but what all burned before you got it out?
Oil pressure, water temp, injection pump fuel solenoid, glow plugs, water in fuel sensor, fast idle/timing advance are all in the same harness.
Oil pressure, water temp, injection pump fuel solenoid, glow plugs, water in fuel sensor, fast idle/timing advance are all in the same harness.
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That's what I thought it was. The only thing actually burning was the plastic conector part of the harness. It doesn't look like any of the actual wires leading up to the harness were burning. The plastic melted together pretty well so it will probably be hard to get apart. I left the truck at a friends house down the street so I'll have to wait until tomarrow when I can walk over there to check it out again. I forgot to mention that the first time it happened I blew it out and the truck started right up with no problems so I drove down the street but the truck would not turn off even without the key in the ignition so I had to unhook the batteries to get it to shut off. It's a '90 F350.
Post Fiend
Joined: Nov 2003
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From: Nutter Fort, WV
Those connectors are not the greatest. The glow plug wires are generally where the problem is from, they carry lots of amperage. You must have a short in the connector now. Probably you can cut the connector out and splice the wires together. I used a copper split bolt to connect my glow plug wires together and used rubber splicing tape to insulate it. The rest of the wires do not have much amperage on them so they are easy to splice.
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I did what you suggested and everything worked out great. The hardware store only had brass split bolts but they seemed to work well enough. The hardest part was working with such little slack on the wires. I spliced the glow plug wires and the fuel shut off solenoid and left the rest in the harness as they seemed to still be connected cleanly. I took it for a short drive and everything seems to be working well. Thanks for your help, I really appreciate it.
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