Battery light Subaru EJ20

Asked by Luuk_H Dec 06, 2018 at 04:14 PM about the 1999 Subaru Legacy

Question type: Maintenance & Repair

I have just installed a subaru EJ20 phase II engine in my VW Vanagon.
Everything works fine except for my battery warning light which remains on. It
is on when I turn the key and remains on when the engine is running. It
switches off when I disconnect the warning light cable from the alternator.
The alternator workes fine and privides 15 volts to the battery when the
engine is running. I have no clue what is going on here so any help would be
appreciated!

1 Answer
22,660

Guru9FSV8 answered 6 years ago

15 volts May be too high and outside the working range for your pcm. Voltage regulators can be bad when voltage is too low or too high. Hence “regulator”. When you start getting into the 15 volt range and higher you can boil your battery.

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