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1990 Ford Ranger Battery Drain

Tiny
CTULK21
  • MEMBER
  • 1990 FORD RANGER
  • 6 CYL
  • 2WD
  • MANUAL
  • 100,000 MILES
Hello,

I recently purchased a 90 Ford Ranger for back and forth to work. I needed to bost the truck to take it for a test drive and we all thought it would just require a new battery. So I put in a new battery and it was dead the next day. I charged the battery and then put my meter on it and noticed the volts dropping 0.01 every second. There was/is nothing on in the car and it was not running. What could cause such a rapid voltage drop with apparently no draw? (Grounding problem?). Any help would be appreciated.
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Tuesday, November 18th, 2008 AT 4:42 PM

1 Reply

Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
Hi there,

Place an Amp meter between Battery Pos(+) and the cable, this will show the true current draw, check with doors closed & key out, allow a small draw for clock radio & ecu memory about.15 Amps if more start pulling fuses & fusible links one at a time, and also disconnect the alternator to check for a faulty diode back feeding, start here.

Mark (mhpautos)
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Tuesday, November 18th, 2008 AT 4:52 PM

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