Electrical issue. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

eighteenninetytwo · 07-15-2021, 01:46 PM

Soooo for the last week or so my 75 blazer (350 SBC) has been struggling to stay running at low revs. Yesterday there was a bit of electrical smell and a tiny bit of smoke form under the dash. At least one fuse (gauge cluster) has gone and when I tried to restart to check and removed the air cleaner I found the electrical choke stuck open, not adjustable manually at all.

Going to remove dash later to see if there is anything SUPER obvious like a short or touching / loose wires, but any ideas?

**old Rusty C10** · 07-16-2021, 11:03 AM

may want to post in electrical too

eighteenninetytwo · 07-16-2021, 12:50 PM

Seems I had two separate issues. I found a short circuit and some melted wire cover in a wire that went to a button for the gauge cluster. Contact with metal (or poor installation) had worn through the insulation so the wire touched the metal plate as it passed through. It had got hot enough to melt 4 inches or so of wire insulation, hence the smoke I saw. This lower bit of the dash had been loose for a while.

The running / stalling at low revs choke issue had started a few days before the burning thing so I suspect they aren't related but just happened along at the same time.

07-15-2021, 01:46 PM	#1
eighteenninetytwo Registered User Join Date: Sep 2013 Location: Redwood city, CA Posts: 694	Electrical issue. Soooo for the last week or so my 75 blazer (350 SBC) has been struggling to stay running at low revs. Yesterday there was a bit of electrical smell and a tiny bit of smoke form under the dash. At least one fuse (gauge cluster) has gone and when I tried to restart to check and removed the air cleaner I found the electrical choke stuck open, not adjustable manually at all. Going to remove dash later to see if there is anything SUPER obvious like a short or touching / loose wires, but any ideas? Last edited by eighteenninetytwo; 07-15-2021 at 02:32 PM.

07-16-2021, 11:03 AM	#2
old Rusty C10 Robert Olson Transport Join Date: Oct 2002 Location: recent transplant to NC USA Posts: 20,312	Re: Electrical issue. may want to post in electrical too __________________ Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!!

07-16-2021, 12:50 PM	#3
eighteenninetytwo Registered User Join Date: Sep 2013 Location: Redwood city, CA Posts: 694	Re: Electrical issue. Seems I had two separate issues. I found a short circuit and some melted wire cover in a wire that went to a button for the gauge cluster. Contact with metal (or poor installation) had worn through the insulation so the wire touched the metal plate as it passed through. It had got hot enough to melt 4 inches or so of wire insulation, hence the smoke I saw. This lower bit of the dash had been loose for a while. The running / stalling at low revs choke issue had started a few days before the burning thing so I suspect they aren't related but just happened along at the same time. Last edited by eighteenninetytwo; 07-16-2021 at 12:57 PM.



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