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Dan, Technician
Category: Chevy
Satisfied Customers: 23745
Experience:  Independent Shop Experience, 2 Year Automotive Diploma, & Access to Information Database
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When i turn on my lights i lose my brake light and turn

Customer Question

When i turn on my lights i lose my brake light and turn signal. Without lights on i have brake and turn lights but dim? I checked for corrosion and grounds they look good. I am stumped.
Submitted: 1 year ago.
Category: Chevy
Expert:  Dan replied 1 year ago.

Hello, my name is***** only rear lights dim or front also? Thanks.

Customer: replied 1 year ago.
Headlights r good it looks like turn signal is a bit weak in front also
Expert:  Dan replied 1 year ago.

Do brake lights seem dim too?

Customer: replied 1 year ago.
Customer: replied 1 year ago.
Expert:  Dan replied 1 year ago.

Access wiring going to brake light, back probe connector with paperclip so you can test power/ground with light still plugged in. It sounds like the multifunction switch/turn signal switch has failed which can cause low voltage to all of the lights. The white wire at brake lights should have battery voltage when pressing brakes and black wire should have good ground. Test voltage back probed at C201 48 cavity connector below the steering column terminal A1 White input from the brake switch, terminal E6 Dark Green wire right brake output, E7 Yellow wire left brake output. Should be B+ when the brake pedal is pressed, brake switch is closed. If the terminal A1 is B+, E6 and E7 are less then battery voltage replace the turn signal/multifunction switch. Let me know how it goes or if you run into questions, thanks.

Customer: replied 1 year ago.
Thanks again
Expert:  Dan replied 1 year ago.

No problem, make sure to let me know if you run into questions. You can reply to this answer at any time without additional fees. Thanks.