[C38] Electrical System Troubleshooting
Don Strong
drstrong at ucdavis.edu
Tue Jan 22 12:07:04 EST 2019
Jay: Weird but not surprising. Wiring on a 30 year old boat in salt
water is bound to be weird. I could tell tales. Corrosion in wires and
connectors that is not readily visible was be a cause in many of my
challenges. I will be interested in hearing the cause of your distress.
Don Strong
C38 San Francisco Bay
On 1/22/19 8:47 AM, Jay Sorensen wrote:
> G'Day All,
>
> We've owned Broad Reach, a 1985 C38 with a fairly standard electrical
> system for about 6 years. I've diagnosed several electrical issues to
> date but this one is something a little different. I replaced our
> aging starting battery with an AGM group 24 battery on Saturday.
> During our outing on Sunday our engine started fine with Battery #1
> (AGM starting battery), but when attempting to turn on any system via
> the panel there was no power. Try battery #2, no power. Try "Both",
> no power. Check the battery voltage using the panel voltmeter, no
> power shown at the voltmeter while the engine was running. Come back
> to the dock, stop the engine, voltmeter shows 12+ volts power at the
> panel from both batteries at the voltmeter. With shore power on the
> panel will power up when jumping to the battery charger cables running
> to the battery switch. Panel will not power up when powered directly
> to either main battery cable. Battery cables showing 0.1-0.2 Ohms of
> resistance but I'm not sure if that is normal. Turned off shore
> power, started motor again with switch to #1, started fine, alternator
> is charging fine. Weird. Next I'll try jumping directly to the
> batteries and bypass the cables but it seems odd that both cables are
> having issues when they show good voltage. Frustrating! Any
> suggestions?? Maybe something where the engine electrical system
> interacts with the system power panel inputs?? Many
> Thanks!...............Jay
>
>
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--
Donald R. Strong
Professor,
Department of Evolution and Ecology
and
The Bodega Marine Laboratory,
University of California, Davis,
Davis CA
95616
530 752 7886
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