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1989 Chevy Blazer open circuit/short

Tiny
GARY TRITTON
  • MEMBER
  • 1989 CHEVROLET BLAZER
  • V8
  • 4WD
  • AUTOMATIC
  • 276,000 MILES
I am trying to find an open circuit in my truck. I have taken out all the fuses and relays and the open circuit is still present.
WHERE DO I CHECK NOW.
The battery has been checked and is good.
Saturday, November 1st, 2008 AT 8:59 PM

4 Replies

Tiny
RHALL77
  • MECHANIC
  • 3,361 POSTS
Is your battery draining down
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Monday, November 3rd, 2008 AT 3:34 PM
Tiny
GARY TRITTON
  • MEMBER
  • 3 POSTS
Yes the battery will drain if I leave the negative post attached to the post. I have also disconnected the alternator and starter and still have a drain.
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Monday, November 3rd, 2008 AT 5:14 PM
Tiny
RHALL77
  • MECHANIC
  • 3,361 POSTS
Did you check to see if the glove box light is on or under the hood light. I just wanna make sure and this is a common mistake, make sure there is no phone or IPOD charger plugged in

How did you check for drain? The amp draw should be about.030 ma. What is the amp draw? You keep an eye on the amp draw as you pull the fuses/relays one at a time.

Sometimes there may be a lite that stays on, under the hood, inside the vehicle, maybe the glove-box. It's easier to see lights in the dark.

Another thought might be to disconnect the alternator, see if the drain goes away. Don't let any live circuits touch ground.
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Wednesday, November 5th, 2008 AT 2:37 PM
Tiny
GARY TRITTON
  • MEMBER
  • 3 POSTS
Yes I have triple checked for any power left on.
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Wednesday, November 5th, 2008 AT 5:11 PM

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