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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: Nov 2005 Posts: 206 'Bolter | | 'Bolter Joined: Nov 2005 Posts: 206 | My 58 1/2 ton is having headlight issue. When ( new) headlight switch is on tail lights work but headlights don't when on dim.... When on bright all 4 lights dim and bright come on. Should I change dimmer switch next ? By the way the gauge cluster light and dome light both quit working at same time as headlight issue was noticed correlation? Thanks guys.
Last edited by txpete; 02/27/2018 2:30 PM.
| | | | | Joined: Dec 2002 Posts: 3,438 Moderator - The Electrical Bay | | Moderator - The Electrical Bay Joined: Dec 2002 Posts: 3,438 |
Another quality post.
Real Trucks Rattle
HELP! The Paranoids are after me!
| | | | | Joined: Feb 2002 Posts: 12,029 Cruising in the Passing Lane | | Cruising in the Passing Lane Joined: Feb 2002 Posts: 12,029 | high beam is supposed to light all 4 bulbs
Bill
| | | | | Joined: Jul 2000 Posts: 2,187 Insomniac | | Insomniac Joined: Jul 2000 Posts: 2,187 | Before you replace the dimmer switch, make sure it's wired properly. Accidentally swapping the high beam lead and the lead from the switch could cause the symptoms you describe. The center terminal on the dimmer switch should connect to the light switch.
I suspect the new light switch is not wired properly.
When you switch on the dome light by rotating the knob, it completes the circuit by connecting to ground. If the panel (gauge cluster) lights are connected to this terminal, they won't come on! They need to be connected to the terminal connected to the rheostat. My guess is that the wires for the dome light and the panel lights are swapped on the switch.
Do you a VOM? It helps for checking these things out.
Gord 🇨🇦
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1954 1/2 ton 235 4 speed
| | | | | Joined: Nov 2005 Posts: 206 'Bolter | | 'Bolter Joined: Nov 2005 Posts: 206 | Thanks guys. What I found was the problem was road grime in the dimmer switch connecting wire. Clean up contacts and all worked great. Lol it's usually something simple right? | | | | | Joined: Jul 2000 Posts: 2,187 Insomniac | | Insomniac Joined: Jul 2000 Posts: 2,187 | What about the dome and panel lights?
Gord 🇨🇦
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1954 1/2 ton 235 4 speed
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