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73-87 Chevy _ GMC Trucks => Electrical => Topic started by: robosmurf on October 17, 2017, 07:53:15 PM
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I was driving home Sunday, and about an hour into my trip I smelled that smell. The burning electrical smell.
Stopped at a rest stop and could really find anything thing, everything was working so I drove about another 30min and stopped for a bite.
When I came back out I had no instrument lights when I pulled my headlight switch, and crank with no start. Still had headlights. Checked the fused and the 5amp instrument fuse and 30amp ECM B were blown. Luckily I walked a couple blocks to the parts place and grabbed a pack of fuses. I replaced the ECM B with no problems but the instrument fuse kept blowing, so I just drove home with no gauge lights. I verified tail lights and brake lights before hitting the road.
Monday I was off so I dove in. I pulled the headlight switch and could smell the burnt right away. I took it apart and found this on the rotor
(https://i.imgur.com/oxSQOOX.jpg)
I cleaned it all off and lubed up the sliders in the switch with some bulb grease and everything seems to be working.
Would this blow the ECM B fuse? It's right next to the instrument fuse.
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Check for shorted wiring behind the dash or bare metal touching the PC board. Take a close look at the rivets retaining the w/w rheostat to the ceramic block to make sure they are tight.
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I needed to pull the cluster and clean it anyway!
(https://i.imgur.com/CzlX7q3.jpg)