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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Oct 2008 Posts: 283 Shop Shark | | Shop Shark Joined: Oct 2008 Posts: 283 | I have a 1958 stepside with a 283. When the heater fan switch is set to low or medium, the resistors on the back of the switch glow red. Is that normal? It's a standard heater arrangement. | | | | | Joined: Dec 2002 Posts: 3,439 Moderator - The Electrical Bay | | Moderator - The Electrical Bay Joined: Dec 2002 Posts: 3,439 | Just a WAG, but no they should not be glowing red... it sounds like you have a short back there.
Another quality post.
Real Trucks Rattle
HELP! The Paranoids are after me!
| | | | | Joined: Mar 2014 Posts: 4,480 Moderator, Electrical Bay | | Moderator, Electrical Bay Joined: Mar 2014 Posts: 4,480 | The resistors? Do you mean the coiled resistor wire? If that's glowing, then it is a sign of something wrong...I'd suspect the armature grounding out possibly.
~ Jon
1952 1/2 ton with 1959 235 | T5 with 3.07 rear end
| | | | | Joined: May 2005 Posts: 8,983 Sir Searchalot | | Sir Searchalot Joined: May 2005 Posts: 8,983 | They do typically get VERY hot but don't know about actually glowing red. You know those older portable bathroom heaters glow red, why? They are basically resistors. As in: A coiled element array. Just inspect the switch and it's coils to see their solder joints and if they are supposed to be separate, coils not touching. I agree with Rusty Rod and Jon's assessment.
Motor possibly dragging, squirrel cage dragging, shaft bearings need oil drops
Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn
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