Originally posted by JJB
Another thing to check for a bad alternator is what happens to the voltage as you change RPM, there is a chance that it can look OK at idle (i.e. around 14VDC) but when you rev the engine the regulation is shot and it shoots up.
I have had this happen (not on my pro) and putting 18VDC on the battery for a while also causes it to die...
Another thing to check for a bad alternator is what happens to the voltage as you change RPM, there is a chance that it can look OK at idle (i.e. around 14VDC) but when you rev the engine the regulation is shot and it shoots up.
I have had this happen (not on my pro) and putting 18VDC on the battery for a while also causes it to die...
that would mean that part of the ECU is shot, since that's what controls it
there's a good possibility that when the old battery went dead, it's internal voltage dropped, so when the car was running, the alternator could only put out about 12-13 volts. the only way to know what the problem is will be to test it. if the car has been run a few times on the new battery, and still cranks up fine, it doesn't sound like the alternator could be bad, since the battery is still getting charged.
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