Parasitic Draw
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Parasitic Draw
Hello!
1973 f250, 390 2wd
Recently ive been having an issue with my battery dying overnight. 12.4v down to 4v in a matter of 2 days sitting.
The alternator does charge the battery when jumpstarted.
The battery is not bad (tested at oreilly).
When i conduct a parasitic draw test, my multimeter reads 0.07 Amps of draw. when i remove the alt. charge wire (the thick red wire) from the starter solenoid, it reads 0 amps of draw. Does this indicate a short at the solenoid? a bad alt? Im surprised 0.07 amps is even enough to drain the battery but here we are.
Thanks
1973 f250, 390 2wd
Recently ive been having an issue with my battery dying overnight. 12.4v down to 4v in a matter of 2 days sitting.
The alternator does charge the battery when jumpstarted.
The battery is not bad (tested at oreilly).
When i conduct a parasitic draw test, my multimeter reads 0.07 Amps of draw. when i remove the alt. charge wire (the thick red wire) from the starter solenoid, it reads 0 amps of draw. Does this indicate a short at the solenoid? a bad alt? Im surprised 0.07 amps is even enough to drain the battery but here we are.
Thanks
Lead Driver
Joined: Oct 2018
Posts: 7,847
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I have a '79 my dad bought new that randomly did this sine it was new. after years of it the problem turned out to be the alternator. or possibly the voltage regulator , I changed them both at the same time and it's never done it since.
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late response but it was the alternator! a failed diode was drawing from the battery when the truck was off. thanks!
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