Wiring Question '92 Ambulance
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4th Gear
Joined: Jan 2026
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Wiring Question '92 Ambulance
Background, the transmission has been fully rebuilt and I went to start the truck, this connection smoked and melted.
Hello, I am trying to figure out why this connection is melting. It looks like a cable that is coming from the starter is melting it. The starter does turn, but the truck does not turn over. It would heat up rapidly to smoking when I tried to turn over the engine.
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Welcome to FTE.
Please clarify:
"...starter does turn..." "...but the truck does not turn over....".
If the starter turns and the engine does not, then the starter is not connecting with the ring gear and you have a mechanical problem in that area.
If you mean that the starter turns but the engine does not start, that's something else.
As to why the connection is melting, what is that connection for? Where do the wires lead? Have you worked on that wiring bundle?
Things smoke and melt due to overload or dead short. Check for both.
Please clarify:
"...starter does turn..." "...but the truck does not turn over....".
If the starter turns and the engine does not, then the starter is not connecting with the ring gear and you have a mechanical problem in that area.
If you mean that the starter turns but the engine does not start, that's something else.
As to why the connection is melting, what is that connection for? Where do the wires lead? Have you worked on that wiring bundle?
Things smoke and melt due to overload or dead short. Check for both.
Tuned
Joined: Jun 2013
Posts: 441
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From: Craigmont, Id
Logistics Pro
Joined: Sep 2007
Posts: 3,739
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From: Western Mass
If that is the connection I think it is, the two larger wires on the right go to the glow plugs. That is a known weakness in the harness, the plastic will melt and there won't be a good connection there. You can cut them out of the connector and find a way to bypass it. I think some people just cut the connectors from the glow plug wires and use a butt connector on them.
Since those wires go to the glow plugs, the glow plugs aren't working right and that is why you're having trouble starting the engine. Make sure you fully charge up the batteries while fixing the wiring and see if that helps.
Since those wires go to the glow plugs, the glow plugs aren't working right and that is why you're having trouble starting the engine. Make sure you fully charge up the batteries while fixing the wiring and see if that helps.
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4th Gear
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Hi tecgod13, Thank you for your expertise. It does connect to the glow plug relay. I will cut it out and bypass the harness to see if it works.
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