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#1455670 Mon Jun 20 2022 02:16 AM
Joined: Sep 2015
Posts: 55
Right side brake light does not light.. Left and right brake lights have separate wires running the length of the the truck. I see 2 wires on the brake light switch which is mounted inside the engine compartment. The depressed foot brake pedal allows the the light switch to send current to the brake lights. I have traced the right side wire to a junction abut 3/4 of the way forward. No voltage. The switch turns the left side on but not the right side...
I'm stumped as to what I should try now. Switch? Wire? The left brake light works. Rear running lights work and signals work.. Just the right side brake.

Joined: Mar 2004
Posts: 6,198
The problem is more than likely in the turn signal switch. Search turn signal wiring diagrams to understand how they work.

Mike B smile

Mike Boteler

1956 Chevy 3100 Resto Rod []
1956 8400 Wrecker w/Holmes 525 []
1956 9200 Tractor w/Allison Automatic []
1952 Willys M38 Army Jeep
1953 Willys M38A1 Fire Jeep
1978 CJ-5 Navy Jeep
Hughesville, MD
Joined: Aug 2019
Posts: 216
And never under estimate a bad ground. I ran independent ground wires to all my lights from a dedicated ground connection box I installed on my ‘57 3200.

1957 Chevy 3200
PS, A/C, Tilt column, Rebuilt 350, Rebuilt TH350, Reupholstered Bench Seat, sound proof/insulated, LED headlights/taillights
Joined: Nov 2000
Posts: 2,089
Several makes and styles of aftermarket turn signal switches were available back in the day. Some connected the turn signals, brake lights and parking lights with as many as 8 wires. How many wires are coming from the switch? What make/brand is it?

There is an old tech tip from Cletus about trouble shooting aftermarket turn signal switches, etc. Maybe it will be useful.

Last edited by Frank50; Wed Jun 22 2022 05:11 PM. Reason: add info and link

Professional Novice
Joined: Sep 2015
Posts: 55
Thank all of you for your responses. I need to study them and start sorting out the problem. What I have done so far probably doesn't make sense. There were 2 wires in addition to the power wire that could reach the outgoing switch terminal so made a split there. The other switch terminal had the power wire attached. Underneath the truck there were 2 wires that could join the brake wire to the taillights. Anyway, using the wiring diagram I need to sort out the miscellaneous wires.
I use a short strck to keep the brake pedal depressed when checking lights. I made a split here. Both brake lights work when the pedal is depressed. The parking lights work f and r The left turning signals work f and r. When the right turning signals are activated both the left and right rear signals blink.. The right front blinks only while both rear turn signals blink. As I said i need ro go back and sort using the wiring diagram.

Frank50 #1456677 Tue Jun 28 2022 12:32 PM
Joined: Sep 2015
Posts: 55
2 wires connect to the switch located in the engine compartment.

Joined: Jun 2004
Posts: 8,773
Check the ground on both rear lights.


They say money can't buy happiness. It can buy old Chevy trucks though. Same thing.

1972 Chevy c10 Cheyenne Super
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