My 69 with 351W has suddenly developed problems with keeping the battery charged. We use daytime running lights here in Denmark, so drain is higher than most Mustangs usually have.
My voltage drops below 12V if I idle along in traffic too long and even after a highway cruise is still just 12.4V or so on an Optima red. This is measured with a meter directly on the battery terminals of course, engine off, without any lights or accessories on. At idle without anything turned on I get 12,2V and dropping. At 3.000rpm it charges @ about 12,8-13V without lights or any accessories on. A swap to a known fresh standard 45amp acid battery yields same results even though voltage @ 3.000rpm is up to about 14,0V.
The generator is about 7 years old with 25k miles on it, belt is not slipping as far as I can tell. Ground connection from battery is good.
What then is the most likely culprit? Generator or regulator or...? HELP!
My voltage drops below 12V if I idle along in traffic too long and even after a highway cruise is still just 12.4V or so on an Optima red. This is measured with a meter directly on the battery terminals of course, engine off, without any lights or accessories on. At idle without anything turned on I get 12,2V and dropping. At 3.000rpm it charges @ about 12,8-13V without lights or any accessories on. A swap to a known fresh standard 45amp acid battery yields same results even though voltage @ 3.000rpm is up to about 14,0V.
The generator is about 7 years old with 25k miles on it, belt is not slipping as far as I can tell. Ground connection from battery is good.
What then is the most likely culprit? Generator or regulator or...? HELP!