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Junior Member
Joined: Apr 2022
Posts: 1
From: Cincinnati Ohio
New To The Froum
2003 H2 battery parasite draining my battery in 2-3 days I have taken it to two differant mechanic shop and they can find nothing /replaced with new battery no change,pulled fuses,pulled onstar no add on other then a back up camera..disconnected that also .any help would greatly be appreciated.thx
Super Moderator
Joined: Jul 2007
Posts: 13,056
From: Boat Town USA MI
Welcome to HF. This section is strictly for intros so you can post you questions on how to find a parasitic draw in the H2 section.
I would suggest you search that topic here at Hummer Forums using the search bar in the upper right hand corner. The short form is, put a voltmeter on the battery positive side, look at the reading, start pulling fuses and check the reading after each one looking for when the draw stops or changes.
These trucks are OLD, check that all the grounds are clean and corrosion free by taking each one apart, cleaning with a wire brush and/or Dremel then a shot of CRC Electronics Cleaner.
I would suggest you search that topic here at Hummer Forums using the search bar in the upper right hand corner. The short form is, put a voltmeter on the battery positive side, look at the reading, start pulling fuses and check the reading after each one looking for when the draw stops or changes.
These trucks are OLD, check that all the grounds are clean and corrosion free by taking each one apart, cleaning with a wire brush and/or Dremel then a shot of CRC Electronics Cleaner.
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