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low voltage @ upper helm

Discussion of batteries, chargers, wiring, generators, distribution panels, battery switches, etc.
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Vessel Info: 1987 Carver Voyager- twin 230 hp gas
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low voltage @ upper helm

Postby Crowbar » October 21st, 2019, 10:16 pm

28 ft voyager, twin 230 gas, 4 - house gel 6 V. batteries w/ inverter

I'm getting intermediate reading of 10.5 V on "bridge" circiut. It Runs VHF radio, 1040SX gps & radar. I have 12.2 @ control panel switch w/ engines off and 99% SOC on house system. Where could my two volts go?

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Re: low voltage @ upper helm

Postby bud37 » October 21st, 2019, 10:52 pm

Can you expand on what you mean by intermediate reading.? Has this just started to happen ?

That 12.2 reading is very low....99% SOC should be 12.6 or better at the batteries. Clean all the grounds and positive connections on the bridge feed.
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Re: low voltage @ upper helm

Postby Viper » October 22nd, 2019, 7:19 am

Are you getting this reading from a volt gauge at the bridge? As Bud mentioned, check all your connections at the engine, distribution panel, and behind the helm/dash. They must be tight, clean, and free of corrosion. It could be a faulty gauge so you must confirm the reading with a volt meter and compare.

Also, is the radar a recent install or was it there before this symptom started? Wondering whether the original main supply wire to the bridge is of sufficient size for all the loads that might have been added since factory....common oversight.
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Re: low voltage @ upper helm

Postby km1125 » October 22nd, 2019, 10:32 am

Yes, check all the connections. If you have the push-on blade type buss bars, scrap them and replace with screw-on buss bars. You can get by for a while just pulling all the connections and cleaning them, but you'll be back in the same boat before long. This applies to both the positive and negative bridge buss bars.

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