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Guest Message by DevFuse

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Bad battery or bad alternator test

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27 replies to this topic

#26 uniberp



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  • Walker, MI

Posted 28 September 2012 - 01:08 PM

It starts fine. It was NOT starting consistently with the remote starter. The volume knob on the radio and the cruise was working intermittantly. I think it was the alternator putting noise on the bus, (someone poiinted out this possibility above) combined with a weakened/partly discharged battery, made the electronics go wonky.

It remote-started and radio-cruise worked all week, so it was prolly either the alt or the grounds.

#27 forester2002s


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  • Vancouver Canada

Posted 29 September 2012 - 01:03 PM

but I would suspect 300 amps for 15 seconds is not unusual

15 seconds?
If it takes that long to fire, then the car has other problems.

#28 edrach


    RIP 6/28/14

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Posted 29 September 2012 - 05:22 PM

15 seconds?
If it takes that long to fire, then the car has other problems.

This was an example to demonstrate that there's quite a bit of energy taken out of the battery when starting; usually more than can be put back into the battery in a 15 minute drive. I picked numbers that were reasonable and that I could calculate in my head. Sorry.

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