C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

86 Door/Cargo Lamps Won't Shut Off

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Old 06-24-2021, 06:28 PM
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Rich B.
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Default 86 Door/Cargo Lamps Won't Shut Off

1986 Convertible, manual trans. Plunger switches on door jambs seem to work OK, but door lamps and cargo area lamps won't time out. Battery runs down, of course. I know there's a timer for them somewhere, but I have no idea where.

Could be something else. Would appreciate any help on what to look at. Electrics are my weakest area. This just started this Spring.

If there is a way to disable these lamps, that would work too.

Thanks for any/all suggestions!

--Rich B.

Last edited by Rich B.; 06-24-2021 at 06:29 PM.
Old 06-24-2021, 07:24 PM
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s carter
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This might seem an obvious but needs to be asked since you didn't cover it in the post, did you check the headlight light switch give it a twist to the right to make sure interior lights are not on.
. Also is the hatch switch free

Last edited by s carter; 06-24-2021 at 07:32 PM.
Old 06-24-2021, 08:32 PM
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Rich B.
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Originally Posted by s carter
This might seem an obvious but needs to be asked since you didn't cover it in the post, did you check the headlight light switch give it a twist to the right to make sure interior lights are not on.
. Also is the hatch switch free
Thanks for your reply!

Light switch is all the way right, lights still stay on. Battery is still dead, not taking much of a charge yet. I've owned this car since 1998, it stopped being fun about my 70th birthday, so it doesn't get driven much. Like maybe 20-30 miles a year now.

I did notice that when I switched the key to ON, it made a buzzing noise that I've never heard before. Not a clicking, but a buzz. Very odd. And the lights are still on (it's on the charger).
Old 06-24-2021, 10:23 PM
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Cruisinfanatic
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Originally Posted by Rich B.
1986 Convertible, manual trans. Plunger switches on door jambs seem to work OK, but door lamps and cargo area lamps won't time out. Battery runs down, of course. I know there's a timer for them somewhere, but I have no idea where.

Could be something else. Would appreciate any help on what to look at. Electrics are my weakest area. This just started this Spring.

If there is a way to disable these lamps, that would work too.

Thanks for any/all suggestions!

--Rich B.
Usually the timer relay is the problem
pulling the ctsy fuse should kill the lights

Last edited by Cruisinfanatic; 06-24-2021 at 10:24 PM.
Old 06-30-2021, 09:28 PM
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Rich B.
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Originally Posted by Cruisinfanatic
Usually the timer relay is the problem
pulling the ctsy fuse should kill the lights
According to the diagram in the FSM, the timer is somewhere up & behind the passenger dashboard...Not readily accessible...

And the FSM has the CTSY/CLK fuse controlling fifteen functions...Ugh...

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