clock/Lighter/Courtesy fuse problem
Thread Starter
Racer
Joined: Oct 2013
Posts: 402
Likes: 1
From: Euclid Ohio 44132
clock/Lighter/Courtesy fuse problem
Hello all!! My Clock/Lighter/Courtesy fuse blows immediately when I put a new one in. I took the center gauges out, I took the speedo cluster out, I disconnected the lighter. It still blows. In my owner's manual it says that this fuse controls the clock, lighter, courtesy, anti-theft alarm, glove box, and dome. I checked the under dash lights and the dome light and things look fine. My interior is completely out of the car including carpet so I am trying to get this done before i put the under carpet insulation in. All help is appreciated!! Thanks in advance!!
Pro
Joined: Nov 2002
Posts: 599
Likes: 16
From: vista CA
Get an ohm meter (most voltmeter have an ohm setting) to measure the resistance from the fuse wire to ground. Try to unhook everything connected (remove/disconnect clock, lighter, dome bulb, courtesy light, glove box light and anti-theft module).
If resistance still low you need to trace the wires and physically find the short. If resistance is high with everything off, put them back one at a time to find the bad device.
A light bulb might draw say 1 amp, that means a nominal resistance of 12 ohms. Shorts typically read near zero ohms.
Former Vendor
Joined: Aug 2006
Posts: 76,656
Likes: 1,853
From: Jeffersonville Indiana 812-288-7103
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15
Hello all!! My Clock/Lighter/Courtesy fuse blows immediately when I put a new one in. I took the center gauges out, I took the speedo cluster out, I disconnected the lighter. It still blows. In my owner's manual it says that this fuse controls the clock, lighter, courtesy, anti-theft alarm, glove box, and dome. I checked the under dash lights and the dome light and things look fine. My interior is completely out of the car including carpet so I am trying to get this done before i put the under carpet insulation in. All help is appreciated!! Thanks in advance!!
Early 78
Late 78-82
Former Vendor
Joined: Aug 2006
Posts: 76,656
Likes: 1,853
From: Jeffersonville Indiana 812-288-7103
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15
I think if you go over this list you'll find your wire.. I traced the entire orange wire circuit tonight to see if I could figure it out... Have you looked at the spare tire lamp.
Here are the items (unless I missed one and if i did, someone feel free to post in).
LH COURTESY LAMP
RH COURTESY LAMP
Glove box lamp
Dome lamp
Spare tire lamp
Anti Theft Relay
Anti theft horn engine compartment.
courtesy lamp timer.
Clock
Good luck.. there is a 1981 timer circuit trace on my web site you can up load under Repair and install help.. it might help you but it's way different than the 78.
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Melting Slicks
Joined: Oct 2006
Posts: 2,417
Likes: 336
From: Texas
car alarm, anti theft protector switch and control arming switch. goes on the key door lock.
http://www.corvetteforum.net/c3/tune.../index24.shtml
http://www.corvetteforum.net/c3/tune.../index24.shtml
Last edited by speedreed8; Jan 27, 2015 at 10:59 PM.
2026 Loser of the Year
Joined: Sep 2013
Posts: 36,597
Likes: 7,046
From: New Or-leens Loo-z-anna
Like Willcox said....Also......There was a recall on the storage light that I read about. Techs accidentally connected the two wires to the light in "reverse",,,,the ground went to the bulb positive contact/the 12vpositive was connected to the socket ground terminal/eventually something would cause a direct short that never blew the fuse because of the long run of wire....which explains why that sub-harness in my '68 car was fried from the light almost to the dash.
Please keep your battery disconnected until you find the short.
Please keep your battery disconnected until you find the short.
Thread Starter
Racer
Joined: Oct 2013
Posts: 402
Likes: 1
From: Euclid Ohio 44132
Racer
Joined: Jul 2008
Posts: 338
Likes: 4
From: Bowling Green Kentucky
There are six screws that hold the glove box into the dash. 2 upper, 2 lower and 1 on each side. On the right side, the screw also has a small metal plate that is the cover for the light bulb and socket. If you pull the glove box out you will see what I'm talking about. Check the wires for the light to see if the glove box screw has been threaded through them.
Thread Starter
Racer
Joined: Oct 2013
Posts: 402
Likes: 1
From: Euclid Ohio 44132
There are six screws that hold the glove box into the dash. 2 upper, 2 lower and 1 on each side. On the right side, the screw also has a small metal plate that is the cover for the light bulb and socket. If you pull the glove box out you will see what I'm talking about. Check the wires for the light to see if the glove box screw has been threaded through them.
Last edited by VETTE N ME; Jan 29, 2015 at 06:35 PM.
Thread Starter
Racer
Joined: Oct 2013
Posts: 402
Likes: 1
From: Euclid Ohio 44132
Solved!!! Sort of
Well I got a set of test leads and hook them up to the fuse slot and then to a 12volt light. The light came on and I then started unplugging things that looked suspect. I unplugged this and the light went off!!
NOW I NEED TO KNOW WHAT RELAY IS THIS? THE FUSE NO LONGER BLOWS, SO COULD THIS RELAY BE THE PROBLEM?
NOW I NEED TO KNOW WHAT RELAY IS THIS? THE FUSE NO LONGER BLOWS, SO COULD THIS RELAY BE THE PROBLEM?
Last edited by VETTE N ME; Jan 31, 2015 at 05:50 AM.
Advanced
Joined: Jun 2014
Posts: 58
Likes: 2
From: New Jersey
At the relay, try disconnected the the other plug (it goes out to the antenna) and reconnecting the plug that you have removed.
For reference, if you do need to remove the antenna itself, the connector on my 79 is accessed by removing the left rear speaker.
For further reference, to test the antenna on my 79:
Antenna up = Green +, Grey -
Antenna down = Green -, White +
For reference, if you do need to remove the antenna itself, the connector on my 79 is accessed by removing the left rear speaker.
For further reference, to test the antenna on my 79:
Antenna up = Green +, Grey -
Antenna down = Green -, White +
Thread Starter
Racer
Joined: Oct 2013
Posts: 402
Likes: 1
From: Euclid Ohio 44132
At the relay, try disconnected the the other plug (it goes out to the antenna) and reconnecting the plug that you have removed.
For reference, if you do need to remove the antenna itself, the connector on my 79 is accessed by removing the left rear speaker.
For further reference, to test the antenna on my 79:
Antenna up = Green +, Grey -
Antenna down = Green -, White +
For reference, if you do need to remove the antenna itself, the connector on my 79 is accessed by removing the left rear speaker.
For further reference, to test the antenna on my 79:
Antenna up = Green +, Grey -
Antenna down = Green -, White +