| [GMCnet] Isolator -- bypass? [message #326801] |
Wed, 06 December 2017 12:47  |
Dave Stragand
Messages: 307
Registered: October 2017
Karma:
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Senior Member |
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Hi All,
Just started poking at the no-charging issue on our 1978 Transmode
(403).
Thanks to whomever created that great flowchart for troubleshooting
charging issues. I was able to determine that the alternator voltage
(center pole of the isolator) to battery terminal ground was 14.70
volts, so the alternator seems within spec..
However, both of the output poles on the isolator (top and bottom) are
connected directly to the same point - the "vehicle battery positive
pole". On a Transmode that may not have had a second or house battery,
that kind of makes sense to me, but if that were the case, why would GM
bother to install an isolator? In any case, the reading from either
pole on the isolator is a dismal-but-steady 12.02V - and that's too low.
It matches the 12.0 on the cheapo cigarette lighter voltmeter inside.
That leaves me with a few questions, and I was hoping y'all might be
able to help.
1) Is the low voltage on the battery sides of the isolator possibly
caused by the fact that both the upper and lower outputs are connected
together?
2) Considering I don't really have any house circuits at present (it's
a Transmode with a partial homemade interior), can I simply bypass the
alternator for the time being, connecting the alternator wire directly
to the "vehicle battery positive" pole?
3) If my isolator is indeed shot, does anyone have a good used spare
they'd like to sell, or should I just buy a new one from one of our
awesome vendors?
Thanks, All!
-Dave
1978 Transmode (403)
Pittsburgh, PA
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1978 Transmode (403)
Pittsburgh, PA
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