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Old 14-06-2021, 06:33   #1
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Join Date: Jul 2007
Location: Florida cruising currently
Boat: Hunter 410
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Voltage Regulator

I had a near hit lightning strike yesterday. Thought I got off with just a burned up DC fan, but no.

Ran engine and my voltage spiked. The sense wire fuse isn't blow, but the regulator, Balmar ARS-5, doesn't light up at all like it even comes on.

Does it make sense that the alternator in this case with a non operational regulator goes high voltage? Guess when it comes right down to it anything could happen because who knows what is going on inside the regulator circuitry.
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Old 14-06-2021, 08:05   #2
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Re: Voltage Regulator

[QUOTE=sailorboy1;3426019
Does it make sense that the alternator in this case with a non operational regulator goes high voltage? [/QUOTE]

Guess it matter little if it makes "sense". The fact here is that with the regulator off it is sending full battery voltage to the alternator field and gave a pretty good flash when I pulled the wire under load off the regulator to stop.
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Old 14-06-2021, 08:48   #3
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Re: Voltage Regulator

Yes that happened to us, though not from a lightning strike. Voltage was spiking sporadically as high as 16.5V. I figured the regulator had failed and it was just operating at max. output.

When it happened we had just left Raiatea, French Polynesia. Our short-term solution was to run a hair dryer through the inverter to dump power! Then I disconnected it until we scrounged a replacement from a junk yard in Rarotonga. Still using that one now, 4 years later. :-)
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Old 14-06-2021, 09:21   #4
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Re: Voltage Regulator

I had a spare that was an older unit that worked, but had a faulty alternator temperature reading. I had even already pre-reprogrammed it last year for my FireFly batteries. Plus last year I added the alternator temp sensor and that appears to have fixed the problem it originally had. It still means a $250 spare part needing order.
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