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mitch
Novice
Aug 6, 2012, 6:46 PM
Post #1 of 12
(1676 views)
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94 chevy brake lights
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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?
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Hammer Time
Ultimate Carjunky
/ Moderator
Aug 6, 2012, 6:54 PM
Post #2 of 12
(1668 views)
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Re: 94 chevy brake lights
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What's a crash light? Do you mean the 3rd (high mount) brake light?
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mitch
Novice
Aug 6, 2012, 7:00 PM
Post #3 of 12
(1663 views)
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Re: 94 chevy brake lights
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yes thats what i mean. sorry i have always called it a crash light
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Hammer Time
Ultimate Carjunky
/ Moderator
Aug 6, 2012, 7:01 PM
Post #4 of 12
(1654 views)
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Re: 94 chevy brake lights
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You most likely have a bad Combination switch in the steering column.
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mitch
Novice
Aug 6, 2012, 7:05 PM
Post #5 of 12
(1648 views)
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Re: 94 chevy brake lights
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i have already replaced it. i have tested it too and the switch works fine.
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Hammer Time
Ultimate Carjunky
/ Moderator
Aug 6, 2012, 7:14 PM
Post #6 of 12
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Re: 94 chevy brake lights
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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.
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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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mitch
Novice
Aug 6, 2012, 7:19 PM
Post #7 of 12
(1624 views)
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Re: 94 chevy brake lights
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the turn signals work and the four ways work so i have no idea whats wrong.
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Hammer Time
Ultimate Carjunky
/ Moderator
Aug 6, 2012, 7:22 PM
Post #8 of 12
(1618 views)
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Re: 94 chevy brake lights
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You're going to have to verify the brake light signal going into the combo switch (white wire) and coming back out.
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mitch
Novice
Aug 6, 2012, 7:26 PM
Post #9 of 12
(1613 views)
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Re: 94 chevy brake lights
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can you explain to me how to do that?
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Hammer Time
Ultimate Carjunky
/ Moderator
Aug 6, 2012, 7:29 PM
Post #10 of 12
(1606 views)
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Re: 94 chevy brake lights
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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?
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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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mitch
Novice
Aug 7, 2012, 6:34 PM
Post #11 of 12
(1568 views)
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Re: 94 chevy brake lights
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i figured out that the cab was not grounded
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Hammer Time
Ultimate Carjunky
/ Moderator
Aug 7, 2012, 6:36 PM
Post #12 of 12
(1565 views)
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Re: 94 chevy brake lights
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So, you're saying everything works now?
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