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Fireboy Tank Monitors
https://www.smwebhead.com/phpBB3/viewtopic.php?f=21&t=14515
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Author:  wjhecox [ Tue Oct 06, 2015 11:27 am ]
Post subject:  Fireboy Tank Monitors

I recently bought a 2000 248 Vista. I would like to ask some guidance on the tank monitor system. I understand they can be very troublesome. The tank monitor for fresh and gray tanks work great. The black water system is an issue. I pulled the sending units and monitors and conducted a bench test, all worked great. When I plunged the components back into the harness the fresh and gray continued to work as required. the black water tank shows 3/4 to full alternating. I believe it is an issue of resistance in the wire or the connection is shorting out. Any thoughts?

Author:  alex8q4 [ Tue Oct 06, 2015 4:49 pm ]
Post subject:  Re: Fireboy Tank Monitors

None of my monitors work, and it would be great if they did.

Can you simply bypass the harness with a temporary wire to test your theory?

Author:  firecadet613 [ Tue Oct 06, 2015 8:16 pm ]
Post subject:  Re: Fireboy Tank Monitors

I replaced them with the newer style units from Fireboy on my 268 and had no more issues.

Author:  Bliss36 [ Mon Nov 09, 2015 3:51 pm ]
Post subject:  Re: Fireboy Tank Monitors

I was chasing those electrical gremlins also till I found moisture wicks up into the potted circuit board of the sensor and shorts it out. There is a pic of the damage in this link
viewtopic.php?f=6&t=12577&hiliI ended up replacing mine with new, and they already lost their calibration....what junk that company makes

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