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Classic Mustangs Tech Forum

Technical discussions specific to 1964-1967, 1968-1970, and 1971-1973 Classic Mustang. Discuss all tech related to in-line six cylinder and V8 powered Vintage Mustangs here.

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Unread 03-25-2013   #1 (permalink)
351wGrande1970 is offline Rookie


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Default 1970 Charging System not working right?

Bought and installed (correctly) a new alternator, and voltage regulator the other day (Saturday). The mustang started up right away....went to go start it this morning and nothing. Gave it a jump start, and it started.

So, what could be causing this? ....Ive searched and read that a "parasitic drain" can be a culprit....also I found on my mustang the wire to the starter, and a wire to the coil are in really bad shape. Can this contribute?
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1989 Jeep Cherokee 4.0 - Lifted - Previous DD - Sold
1990 Jeep Cherokee 4.0 - Stock - Gave away
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Unread 03-25-2013   #2 (permalink)
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You said it, Parasitic Drain. The process isn't that hard to do, and that's the only way to find it. :kooky:

The wires you mentioned should be repaired, but for now they are working, since you can start by boosting the battery.
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Unread 03-25-2013   #3 (permalink)
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Most parasitic battery drains are caused by aftermarket electronics. Start there. Good luck!
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Unread 03-25-2013   #4 (permalink)
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Quote:
Originally Posted by Bryonl View Post
Most parasitic battery drains are caused by aftermarket electronics. Start there. Good luck!
No aftermarket additions...tomorrow Im gonna hunt down the drain.
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1970 Mustang Grande 351w - New DD

1989 Jeep Cherokee 4.0 - Lifted - Previous DD - Sold
1990 Jeep Cherokee 4.0 - Stock - Gave away
1978 Jeep Wagoneer 360 - Stock - Gave Away
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Unread 03-26-2013   #5 (permalink)
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If you have a test light hook it up between the neg. post and neg. cable end with the cable disconnected. If the test light bulb lights you have a drain. Now with the doors closed, start pulling fuses one at a time. When the bulb goes out you found the circuit the drain is on.
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Unread 03-29-2013   #6 (permalink)
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Checked everything, and turns out my battery was bad. No leak

for the tips guys, was very helpful
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1970 Mustang Grande 351w - New DD

1989 Jeep Cherokee 4.0 - Lifted - Previous DD - Sold
1990 Jeep Cherokee 4.0 - Stock - Gave away
1978 Jeep Wagoneer 360 - Stock - Gave Away
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