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 BoatUS Boat Groups/Manufacturer Forums>>Carver
Subject Topic: 1993 Carver 390: Intermittent Tacometers Post ReplyPost New Topic
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"Seaman Recruit"

Joined: May 29 2007
Posts: 1
Posted: May 29 2007 at 21:40 | IP Logged Quote DowellMD

I have owned a 1993 Carver 390 Aft Cabin for 12 months; it's a great
boat. The only problem that I cannot resolve is that the tachometers
work only intermittently. Usually only the starboard tachometer is
working, but at other times the port one works. Sometimes both
work for a while and occasionally neither of them works! The "Sync"
display dial follows the tachometers (hard over when one works,
accurate when both work).

An electronics guy who has looked at the problem says that the
tachometers are driven from the alternators. He suspects that since
both port and starboard appear to charge whichever battery set is
selected (1 or 2), the tachometer problem may be linked to the
alternators "fighting" over which one whould be charging.

Does anyone know of this problem and the solution to it? Can anyone
suggest further diagnostics to get to the root cause?

Many thanks!

Carver 390 Aft Cabin 1993
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"Seaman Recruit"

Joined: March 20 2007
Posts: 2
Posted: February 05 2008 at 21:54 | IP Logged Quote Carver_Couple


I don't have an answer for you but I can say that I'm experiencing a very similar problem.  We have a 1988 36 Aft Cabin with a single (upper) helm station.  The starboard tach is very eratic and the port tach occasionally gets flakey as well.  There are two other Cavers in our Marina (both 1989 36 Aft models) and they have the same problem at their upper helm.  A freindly mechanic has told me that most likely it is a guage problem.  I've traced out all the wiring that I can get to and don't see any problems.  The only thing I haven't tried yet (and believe me, I've tried just about everything you can think of) is replacing the wiring.  Not a real appealling option to me.

I know this doesn't help your cause, but just wanted to let you know you're not alone. 

Carver Couple

Lake of the Ozarks Carver Owners
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