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94 chevy brake lights


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mitch
Novice

Aug 6, 2012, 6:46 PM

Post #1 of 12 (1572 views)
94 chevy brake lights Sign In

i have a 94 chevy p/u 175,xxx miles and 5.7 motor. i replaced the motor and now the brake lights don't work. they work when the truck is off but when the key is on or the truck is running they don't work the crash light works no matter if the truck is on or not. can anyone help?


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Aug 6, 2012, 6:54 PM

Post #2 of 12 (1564 views)
Re: 94 chevy brake lights Sign In

What's a crash light? Do you mean the 3rd (high mount) brake light?



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



mitch
Novice

Aug 6, 2012, 7:00 PM

Post #3 of 12 (1559 views)
Re: 94 chevy brake lights Sign In

yes thats what i mean. sorry i have always called it a crash light


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Aug 6, 2012, 7:01 PM

Post #4 of 12 (1550 views)
Re: 94 chevy brake lights Sign In

You most likely have a bad Combination switch in the steering column.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



mitch
Novice

Aug 6, 2012, 7:05 PM

Post #5 of 12 (1544 views)
Re: 94 chevy brake lights Sign In

i have already replaced it. i have tested it too and the switch works fine.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Aug 6, 2012, 7:14 PM

Post #6 of 12 (1526 views)
Re: 94 chevy brake lights Sign In

Apparently not. The signal for the 2 lower lights passes through that switch and then directly to the lights so if you have working turn signals the circuit is complete.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



mitch
Novice

Aug 6, 2012, 7:19 PM

Post #7 of 12 (1520 views)
Re: 94 chevy brake lights Sign In

the turn signals work and the four ways work so i have no idea whats wrong.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Aug 6, 2012, 7:22 PM

Post #8 of 12 (1514 views)
Re: 94 chevy brake lights Sign In

You're going to have to verify the brake light signal going into the combo switch (white wire) and coming back out.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



mitch
Novice

Aug 6, 2012, 7:26 PM

Post #9 of 12 (1509 views)
Re: 94 chevy brake lights Sign In

can you explain to me how to do that?


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Aug 6, 2012, 7:29 PM

Post #10 of 12 (1502 views)
Re: 94 chevy brake lights Sign In

You test for power when the brake is applied using a test light or digital voltmeter. If you don't know how to test for power, how are you telling me you tested the combo switch and it's fine?



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



mitch
Novice

Aug 7, 2012, 6:34 PM

Post #11 of 12 (1464 views)
Re: 94 chevy brake lights Sign In

i figured out that the cab was not grounded


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Aug 7, 2012, 6:36 PM

Post #12 of 12 (1461 views)
Re: 94 chevy brake lights Sign In

So, you're saying everything works now?



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.







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