On Star draining the battery
A few days ago i went to drive to work but the truck wouldn't start. The battery appeared to be dead.
I had only used the car 8 hours before and no lights were left on and the car was left as i usually leave it.
The AA were called out and the mechanic said there was no drain on the battery and so the battery was faulty and needed to be replaced.
Although the mechanic said there was no drain comming from the car, when jump started the truck then left it for a while, the lights would go dim and it wouldn't start again.
I noticed that the OnStar button had been flashing red (not sure what this means as we don't have OnStar in the UK) and this was the only thing that had changed before the battery went dead.
So i pulled the fuse for the OnStar (located under the bonnet in the fuse box) and now the battery is fine and the truck starts first time every time.
Just thought i'd share this as although the AA didn't pick up the drain comming from the redundant OnStar activation, it was clearly the cause for the battery being flat.
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