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Author Topic:   Need electrical help

Posts: 28
From: Lincoln, NE
Registered: Apr 2000

posted 04-26-2001 05:41 PM     Click Here to See the Profile for 73STANG     Edit/Delete Message   Reply w/Quote
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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Posts: 466
From: Redwood City, Ca. USA
Registered: Jan 2001

posted 04-26-2001 06:17 PM     Click Here to See the Profile for Doc   Click Here to Email Doc     Edit/Delete Message   Reply w/Quote
If you have a sound system in it disconect the speaker wires and see if the light goes out.

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Posts: 28
From: Lincoln, NE
Registered: Apr 2000

posted 04-26-2001 09:35 PM     Click Here to See the Profile for 73STANG     Edit/Delete Message   Reply w/Quote
I forgot to say that I already have the entire stereo system disconnected.

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Posts: 381
From: Port Allen, La. 70767
Registered: Jun 99

posted 04-26-2001 09:48 PM     Click Here to See the Profile for RonnieT   Click Here to Email RonnieT     Edit/Delete Message   Reply w/Quote
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.

69 mach1 351W-4V
70 Torino GT 351C-4v with a "shaker"
Mustangs and More Member #23

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Posts: 4307
From: Sonoma,CA,USA
Registered: Mar 2000

posted 04-26-2001 10:33 PM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
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,


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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Posts: 533
From: Rowlett,Texas
Registered: Aug 99

posted 04-27-2001 10:52 AM     Click Here to See the Profile for Clark   Click Here to Email Clark     Edit/Delete Message   Reply w/Quote
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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