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Author
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Topic: Need electrical help
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73STANG
Journeyman Posts: 28
From: Lincoln, NE
Registered: Apr 2000
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posted 04-26-2001 05:41 PM
  
I must have a short on my car. If it sits a couple of days the battery is dead. I unhooked the negative cable from the battery and used an old gauge light between the battery post and the unhooked cable. It lit up. I sarted pulling all the factory fuses. The light was still on. I unhooked the electric fans, fuel pump, line lock, MSD box, transmission brake and nitrous circuit. The light was still on. I then unhooked the starter cable from the solenoid. Still a light. I also unhooked the accessory gauge backlighting. Still a light. What am I missing? With all the fusses out and all the other circuits disconnected I thought I would find the short. Any help would be appreciated.
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Doc
Gearhead Posts: 466
From: Redwood City, Ca. USA
Registered: Jan 2001
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posted 04-26-2001 06:17 PM
If you have a sound system in it disconect the speaker wires and see if the light goes out.
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73STANG
Journeyman Posts: 28
From: Lincoln, NE
Registered: Apr 2000
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posted 04-26-2001 09:35 PM
I forgot to say that I already have the entire stereo system disconnected.
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RonnieT
Gearhead Posts: 381
From: Port Allen, La. 70767
Registered: Jun 99
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posted 04-26-2001 09:48 PM
The only item I can think of you did not mention disconnecting is the alternator and voltage regulator. A bad regulator will cause the problem you described.------------------
Ronnie
69 mach1 351W-4V
70 Torino GT 351C-4v with a "shaker"
Mustangs and More Member #23
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steve'66
Gearhead Posts: 4307
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 04-26-2001 10:33 PM
I would turn everything off electrically. Then connect an amp meter between the positive battery and the positive post of your battery. If you don't have a meter, then try touching the cable to the post at night and look for a faint spark. (a meter is best though, cause you'll see smaller current flows than the sparky method) Next, assuming you have current flow, pull one fuse at a time until the current flow stops. That circuit has your offending component or wire in it! It's just a matter of isolating circuits until you find the bad one. When you find the circuit, reconnect the fuse and then disconect the electrical devices on that circuit until it stops again. A process of elimination. Good luck,SteveW p.s. after re-reading your post, you've already done this. Duh, so now you'll have to start disconnecting wires. The old 'stangs didn't have fuse protection on every circuit. Some just have fusible links (which are just a piece of smaller wire). So disconnect wires until your light goes out and keep at it! Good job BTW  [This message has been edited by steve'66 (edited 04-26-2001).]
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Clark
Gearhead Posts: 533
From: Rowlett,Texas
Registered: Aug 99
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posted 04-27-2001 10:52 AM
I would take a good look at the ignition switch, these are highly suspect with our older cars. You will need to find out if power still goes through this with the key off.
If you still have points check the voltage there, the voltage should turn on and off with the ignition switch. ------------------
69 351W Sportsroof Deluxe
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