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Old 21-01-2014, 16:24   #1
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autohelm st4000 phantom dodge

my st 4000 will occasionally veer to port about 20 degrees and then correct back to it's heading. a friend gave me another unit that had been replaced because it would turn 360 on its own. what is going on? its not anything being moved near the flux compass.
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Old 21-01-2014, 17:32   #2
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Re: autohelm st4000 phantom dodge

Mine was caused by 8 or 9 bad solder connections to the four 3 Mosfet transistors in the head unit.
Easy solder fix.
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Old 21-01-2014, 17:52   #3
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Re: autohelm st4000 phantom dodge

Maybe try re calibrate your flux-gate compass.

Requires some button pressing and a 360 degree circle... see your manual.
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