Electrical experts,please step inside.
Thread Starter
Race Director
Joined: Dec 2003
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From: Fremont Ca
2022 C4 of the Year Finalist - Modified
Electrical experts,please step inside.
On a 91 does the electrical circuit for the rear turn signals run through the rear brake light circuit or are these 2 electrical circuits totally separate from each other.Thanks.
Le Mans Master
Joined: Oct 2007
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From: Akron Ohio
2025 Corvette of the Year Finalist - Modified
2024 C5 of the Year Winner - Modified
2023 C5 of the Year Finalist - Modified
2022 C5 of the Year Finalist - Modified
St. Jude Donor '09-'10-'11
Assuming it is the same as my '90, there are two circuits (left and right) that are both activated by the brake pedal switch, and then each one is interrupted by the turn signal. So technically the brake lights and turn signals are part of the same circuit.
Burning Brakes
Joined: May 2011
Posts: 838
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From: Louisville Ky
yes, a turn/bu fuse, stop/haz fuse. diiff circuits, or no?
Le Mans Master
Joined: Oct 2007
Posts: 9,681
Likes: 3,432
From: Akron Ohio
2025 Corvette of the Year Finalist - Modified
2024 C5 of the Year Winner - Modified
2023 C5 of the Year Finalist - Modified
2022 C5 of the Year Finalist - Modified
St. Jude Donor '09-'10-'11
I will have to check again, but I know for sure there are only two wires at the tail lights, left brake and right brake. The other wires are running lights, and ground. The turn signal interrupts the left/right brake light signals.
Burning Brakes
Joined: May 2011
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From: Louisville Ky
I think you are correct, 91 book shows 2 fuses, but one yellow wire left, dk green right, til/turn/stop.
Drifting
Joined: Jun 2010
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From: Westerly RI
As in most cars of that era, and some today as well, the rear bulbs use the same filaments for brake lights and turn signals. The brake light switch (on the pedal) sends power thru the turn signal switch, to the rear bulbs. The left and right sides are separated at the turn signal switch (or 4-way switch) only when the switch, which is double pole/ double throw, is activated.
