RE: 1979 Electrical Problem (short)
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RE: 1979 Electrical Problem (short) - 8/26/2007 8:13:20 PM
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cwb
Posts: 1508
Joined: 5/13/2007
From: eastern NC
Status: offline
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quote:
ORIGINAL: riley6riley
I have had an electrical problem that has been draining my battery for quite awhile. I followed the procedures (Haynes manual) for finding a short in the electrical system. I narrowed it down to the CTSY CLK fuse. This fuse controls the courtesy lights, cigar lighter, door lock switches, door lock motors, and glove box light. It also looks like it feeds into the radio...Is there any way to narrow it down further? If I start disconnecting things, where do you think I should start and the easiest location because this could get pretty deep I think. The interior was all redone about 5 years ago and all original gauges and radio installed. Everything works????? Your help would really be appreciated.
Dan
You're almost done here, because you've found the guilty circuit (RIGHT??? You found the fuse that was carryin' the draw, RIGHT???). Going back upcurrent to the alternator isn't really good advice at all (again, that's IF you DID find the fuse that's carryin' the draw).
Pull the fuse, and check the output for voltage. You should get 0 V. The fuse 'input' will have 12 V, since it's comin' from the battery. With the fuse pulled, the output will be at 0 V. If you get voltage, there's a by-pass somewhere that has been put in somewhere. You gotta' find that, and get rid of it. That's like uppin' the amperage of the fuse. Also check the amperage of the fuse that's in there now. A higher-than-spec fuse is a fire hazard, and will allow the battery to drain, instead of blowin' the fuse, like when there's a short. Get some marshmallows.
If you got no voltage at the fuse output with the fuse pulled, put the multi-meter in the ammeter mode, and connect it to the fuse input and the fuse output. Get a read. Then disconnect and re-connect, one at a time, each device powered by that circuit - the lighter, radio, etc, whatever is on that feed. When the amp draw goes to zero, you got the guilty circuit, AND the guilty device.
If none of the devices gettin' disconnected makes the draw go away, then the short is between the fuse output point, and the first device on that circuit.
< Message edited by cwb -- 8/26/2007 8:21:29 PM >
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RE: 1979 Electrical Problem (short) - 10/1/2007 2:24:11 AM
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riley6riley
Posts: 108
Joined: 4/12/2007
Status: offline
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CWB
Thanks for the help. I get back from deployment (navy) in a month or two and I will try it then. I will let everyone know.
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RE: 1979 Electrical Problem (short) - 11/9/2007 5:29:14 PM
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riley6riley
Posts: 108
Joined: 4/12/2007
Status: offline
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I may have found the problem. I was getting ready to check the amperage and noticed that my passenger window would not open or close. I am going to pull the motor out tomorrow and take a look. I reall hope this is the problem because I have the center gauges out and disconnected the radio wires (red/yellow) and the short is still there.
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RE: 1979 Electrical Problem (short) - 11/15/2007 4:37:08 PM
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Phill
Posts: 187
Joined: 9/19/2006
Status: offline
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Hi R6R. have you found the short. i hate working on electrical problems. i had a similar problem on my 79 but the battery would drain in a matter of a day. mine turned out to be the ground to the wiper motor and blower motor where connected to a live wire. grounded those wires and the drain was gone and wiper and blower motor started working. killed three birds with one stone. so my advise is to check as much of the wiring as possible. good luck and keep us informed.
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RE: 1979 Electrical Problem (short) - 11/18/2007 2:09:29 AM
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riley6riley
Posts: 108
Joined: 4/12/2007
Status: offline
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Phill,
no luck with the short yet. I got back from deployment about a week ago and got right into the electrical problem. I disconnected everything again with no luck. My passenger window had stopped working and I thought I found the problem but it was just a loose connection. Disconnected all the gauges and everything in the center counsel and the panel with the speed ommeter with no luck.
When I have my key on, not started, I can hear a fan blowing over behind the glove box. Not sure where it is, should it be on? I can't turn it off with the fan control....One more thing I noticed, with this problem, I do not have any warning lights coming on. I assume there is a battery light and so forth but they don't light up. I am almost to the point of taking it to Tidewater Auto Electric here in Virginia Beach and tossing some money at it. I think I am to the point of "I don't know what the @%^& I am doing". I am still working on it though.
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RE: 1979 Electrical Problem (short) - 11/19/2007 5:42:19 PM
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riley6riley
Posts: 108
Joined: 4/12/2007
Status: offline
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One more question. I have a wiring diagram for chevy cars and corvettes. My short disappears when I pull the ctsy clk fuse. Looking on the wiring diagram it goes to the stop lamp switch, horn relay, ctsy lamp timer delay timer, and the seat belt and key warning buzzer. Does anyone know where these items are located? If you know the general location, I can dig around for them in the car.
On the wiring diagram, it has the wires going to numbered boxes, can I assume that these are connectors and that is were the wires split off? I refuse to give up on this. I would really like to drive the car!
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