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voltage after start 12.5v, 30s later 13.7v

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It normally happens on the first start of the day, it takes a while before the voltage shows 13.7v and i live in warm climate. The alternator is about a month old. I do have a blue sea setup with 2 batteries, is it going through some testing before isolating?

Any ideas?


Edited by bankshk
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Did this start reciently? Like with the new altenator? Next cold start, have a buddy read the voltage off the altenator during and after start with a multimeter, make sure the meter and dash make the change tom13.7 at the same time. Imhave never heard of a BIT on an altenator, it is either making power or not, the dash shows system voltage,what ever makes the most power wins.

hope this helps......fun problem

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yes it started with the new alternator. i was hoping it might the belt getting tired and doesnt spin up the alternator till warmed up properly?

i have it wired as per the blue sea add a battery instructions, so starter battery + to bottom of 2 (on the switch) , and alternator out of the top of 2 (on the switch) is that correct?

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I'm betting your new alternator has a "soft start" feature in the voltage regulator. It waits 30 seconds before fully charging. I upgraded mine this spring and have the exact same deal. Luckily the technician warned me about it after the install.

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