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Old 06-24-2018, 03:17 PM   #1
City: New Bedford
Country: USA
Join Date: Sep 2015
Posts: 14
05 MS400 - Voltage Gauge


I've got an 05 Trawler with twin Yanmars 240's. Both upper and lower station have the 3 in 1 and 4 in one Faria gauges on the port and starboard sides respectively (fuel, temp, oil, voltage). Everything is good on the lower station. The upper station everything is good except on both port and starboard gauges there is no voltage reading. I haven't thought about the gauges before so I'm hoping for a little primer to get me going on diagnosing the problem. Here's what I think:

1) I highly doubt it's the gauges as all other readouts are functioning (and both are exhibiting same behavior)

2) It's odd to me that both voltage gauges are reading zero ( I could see one side or the other, but both?)

3) It's not the ground or all functions of the multi gauge would not be working

4) Given other things that I've find with the Mainship wiring, it wouldn't surprise me at all if both volt gauges are connected to the same source (which would explain both not working)

5) I assume that there is no sender unit and the gauges read straight voltage (is this correct?)

6) What is the source of the voltage reading (connected to alternator or straight to battery?)

I took a quick look, but need to do a more careful look to see if there are any sensing wires that didn't get hooked up to the batteries during commissioning. Otherwise I'm starting from square zero. The wire bundles are a dense maze. Alternator output and battery health are fine. This is purely a sensor/gauge issue.

Thanks for any advice to get started.


p.s. cross posted to yahoo mainship group
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