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Reverse Lights not working

 
Old 06-23-2019, 02:07 PM
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akotual
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Default Reverse Lights not working

Hi there I have a 1991 ZR1 and the back up lights do not work when I shift into reverse and the third brake light also doesn't work? Anyone else have these problems?
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Old 06-23-2019, 04:50 PM
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secondchance
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Originally Posted by akotual View Post
Hi there I have a 1991 ZR1 and the back up lights do not work when I shift into reverse and the third brake light also doesn't work? Anyone else have these problems?
Suggest you start with the obvious.
Back up light - most likely caused by back up switch mounted on the driver side of the transmission. Can be bought at corvettecentral, mid America, etc.
3rd brake light (CHMSL) - start with light bulbs.
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Old 06-23-2019, 04:57 PM
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The light bulbs are the easiest place to start. The back up light switch is on the driver side of the transmission and itís really tucked up high on the trans. I have a rat rod with a ZF that I took the CAGS solenoid off of and I swear that was the only way to snake my hand up in there to get to it. If your CAGS solenoid is still in place itís a very tight fit.
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Old 06-23-2019, 06:49 PM
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To verify switch remove wiring connector from switch and jump between contacts. (Trans in reverse, key on) If the lights work it is a faulty switch. Pretty common ZF issue.
Here's a pic of what you need if you determine the switch is faulty.
Replacement switch
Long, slim design 3/8" swivel ratchet.
O-2 sensor socket.

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Old 06-23-2019, 07:25 PM
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billschroeder5842
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Originally Posted by secondchance View Post
Suggest you start with the obvious.
Back up light - most likely caused by back up switch mounted on the driver side of the transmission. Can be bought at corvettecentral, mid America, etc.
3rd brake light (CHMSL) - start with light bulbs.
This is your solution as it is very common. Rather than jacking with the install myself (I looked and surrendered quickly too tight quarters from a driveway jack) I took my part to one of the "Jiffy Quick" oil changes places. They were able to get under it from the oil change booth and swap it in and out in less than 10 minutes. I'm a regular customer so they were going to do it for free, but I brought them a 12 pack.

The beer based economy is alive and well.
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Old 06-24-2019, 09:00 AM
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FASTAZU
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As far as the 3rd brake light (CHMSL) Check the switch on the pedal. If I remember correctly it has two sides white for the tail lamps and the light blue wire is the one that powers the CHMSL.
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