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5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

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Old 03-20-2008, 06:50 PM   #1
bbbngowc
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Default Electrical Problems

Ok. I jump in my car the other day and battery is dead. I take the battery and change it for a new one. But I can't connect it. There's tons of sparks whenever I try to connect the cables to it. What's the problem here? I used a voltmeter and ampmeter and nothing seems to be pulling. All fuses are fine.
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Old 03-20-2008, 06:53 PM   #2
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Default RE: Electrical Problems

Is the negative an dpositive where they, go, ? what do you meen tons of sparks?
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Old 03-20-2008, 06:59 PM   #3
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Default RE: Electrical Problems

Dude! Like fireworks. And if I leave it on for say 2 sec ... a spark comes from the positive and then I get no sparks at all and no juice from the battery. I'll have to take the positive on and then reconnect it for the sparks to come back.
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Old 03-20-2008, 07:02 PM   #4
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Default RE: Electrical Problems

what are you testing with the dmm? nothing can pull a charge without the battery hooked up. when you go to connect the positive terminal you may get a very tiny single spark from something that is always trying to draw power (clock for example), but after that initial spark if you didnt jump/remove the terminal again you should be fine. if its constant than you have a short somewhere, and should have blown a fuse by now
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Old 03-20-2008, 07:06 PM   #5
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Default RE: Electrical Problems

Can you get a video up
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Old 03-20-2008, 07:07 PM   #6
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Default RE: Electrical Problems

I connected the positive cable and put the ampmeter in series with the battery and neg wire. Nothing high there. When I connected the negative back, there was so much spark that it burned the terminal. Clearly something is wrong here. How do I find the problem? Where i? the main batteryfuse in a 91 Fox?
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Old 03-20-2008, 07:14 PM   #7
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Default RE: Electrical Problems

Ok. I just went through all the sparks and got the cables on. But the car is still completely dead. This is a new battery.
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Old 03-20-2008, 07:18 PM   #8
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Default RE: Electrical Problems

I just tested again. When the battery cables are disconnected (at least when the positive cable is disconnected) the battery voltage is 12.4V. When the cables are connected, it's 4V. How can I find what the heck is pulling this and why all of a sudden?
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Old 03-20-2008, 07:29 PM   #9
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Old 03-20-2008, 08:02 PM   #10
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Default RE: Electrical Problems

check for a short but more importantly with the pos cable on and ammeter connected in series on neg cable ..what is your reading...do you know what acceptable spec is?? it's 25 to 50 milliamps..you need a digital multimeter to run the test set to amps function
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Old 03-20-2008, 08:02 PM
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