Electrical issue after disconnecting the battery

Tiny
COLLIN WEBB
  • MEMBER
  • 2005 SUBARU LEGACY
  • 2.5L
  • 4 CYL
  • TURBO
  • AWD
  • MANUAL
  • 120,000 MILES
Tried installing a blow off valve and must have blown something. I unplugged the battery and when I plugged it back in my radio, clock, automatic air conditioner and heater, dome lights, key less entry went out. Checked all the fuses and they are all fine, I do not know what to do. I tried tapping into the clock when installing the bov. Help me please!
Saturday, September 10th, 2016 AT 2:20 PM

2 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,722 POSTS
Is there any wiring such as a system ground that was left off? Here is a guide that can help you.

Please let us know what you find so it will help others.

Best, Ken
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Wednesday, September 14th, 2016 AT 8:03 PM
Tiny
CARADIODOC
  • MECHANIC
  • 33,881 POSTS
Hi guys. Are you aware there are fuses inside the vehicle and under the hood? It is pretty common for one or two to blow from current surges when reconnecting the battery. That is less likely to happen to the large fuses under the hood, but that is what is suggested when you have multiple dead systems like you described.

The radio will always have two fused circuits. The one for the memory circuit is not labeled as such. It is always tied in with some other circuit that is always live, and the interior lights is a common one.

Where I would start is by measuring the voltages on the fuses for some of the dead circuits, but ignore the radio for now. The smaller fuses have two tiny holes on top where you can stick the meter's probe. You can use a test light too. It's faster and can be more accurate in some cases. Based on what you find or find missing, we can figure out where to go next.
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Friday, September 16th, 2016 AT 2:27 PM

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