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M1009 Burning smell from dash?

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86k5

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help please... there is an unusual smell coming from up under the dash when accelerating.. doesn't do it at idle. almost smells like things are about to catch fire.. but i've looked over the mess of wire under the dash and can't seem to find anything that has been hot to the touch.

1986 K5 blazer cucv 22k miles.
 
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patracy

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Have you read the TM's? The CUCV electrical system can be, well challenging. A volt meter is a must.
 

M1031CMT

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What is getting 30v? Like Patracy said, that is too high.

If it is reading 30v, it "could be" that like your alternators are over-charging the system.

It should read 28v-28.5v max at all times on the 24v part of the system. The other part of the system should be 12v-13.8v.

If it is the alternators, they are likely dumping out more voltage into the system, causing certain things to heat up.

Might not be something under the dash, but in the engine compartment and the smell being blown into the cab.

You will have to pull out the wiring diagrams and your voltmeter to check to track down the voltages.
 

Titanium Soldier

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if you feel like doing a lazy check to rule out over voltage, try diconnecting the alts and running it on battery power for a minute see if it still smells, just not to long or you wil kill your bats
 

doghead

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Warthog

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Reposting your question from the Headlight Circuit thread as it is the same issue and belongs here.
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I've been having problems with a "hot" smell from up under the dash, and even melted a fuse.. the plastic part literally melted off and on to the floor board.. put in a new fuse. problem seemed to go away for a bit... well its back.. the fuse box seems fine to me. all fuses in tight and clean.. glow plug module under dash looks good too, but the harness on the fire wall side from the fuse box looks like its been over heated a time or two.. how would i go about replacing the wire connectors for that "head light harness?" ?

ps.. the "hot" smell gets worse when accelerating.
 

mistaken1

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If plastic melted something got hot. If you can smell it when using the vehicle something is still getting hot. Poor electrical connections act like the heating element in a toaster.

If you are not carrying a fire extinguisher I recommend you do so until you resolve this problem.
 

hvillem1009

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I had the same problem before. I had to pull the dash apart and that is when I noticed the wires going to the started relay were burnt bad. My voltmeter did show over charge before the burning smell. I have since replaced start relay with doghead conversion and replaced wires.
 
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