Okay everything is back on the ole girl.
When first started it was charging 12.1 at idle then it raised to 13.4 and would drop to 12.2 with a/c, lights and defog on.
It will recover to about 13 volts at 2000 rpm with everthing on.
What I saw happening is when first turned on the voltage drops about two volts till the gp relay cycles off, about 30 seconds.
There is a one to two minute delay before the alt begins charging, once it kicks on it seems to be able to maintain at least 12 volts depending on the rpm. (from 12.2 to about 13.0)
1. It appears the alt is marginal for the load requirement,
2. It doesn't begin charging immediately.
Any suggestions?

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Darrell

1984 300SD "Ole Girl"
207K