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Author Topic:   Diagnosing gauge malfunction
alkar posted 09-14-2003 08:20 PM ET (US)   Profile for alkar   Send Email to alkar  
I recently replaced all of my corroded gauges with new Honda gauges. When I was through with the installation everything on the starboard side worked perfectly...and nothing on the port side did. I've checked the wiring and there are no errors. I have power at the wiring harness.

What would you guys suggest as the next in the series of diagnostic steps?

jimh posted 09-14-2003 08:46 PM ET (US)     Profile for jimh  Send Email to jimh     
Are there dual engines? Dual batteries?

Bond the negative terminal of the batteries together. Try a jumper cable to test. This might part of the problem with electrically operated gauges.

HAPPYJIM posted 09-14-2003 08:52 PM ET (US)     Profile for HAPPYJIM  Send Email to HAPPYJIM     
swap gauges

Any fuses in the line?

alkar posted 09-14-2003 11:51 PM ET (US)     Profile for alkar  Send Email to alkar     
I have twin engines, each with dual batteries (for a total of four batteries). The batteries for each motor share a common ground; they're hooked up to a Perko "1,2,all,off" switch. I believe the battery confguration is the same as it was when the other gauges were in place and functioning properly, but perhaps I failed to reconnect the common ground from one PAIR to the other. Is that what you think I should do Jim?

Should I bond the ground terminals for one pair to the other? I don't undstand why that should be necessary. Shouldn't the function properly as two completely independent systems?

Alex

jimh posted 09-15-2003 07:56 AM ET (US)     Profile for jimh  Send Email to jimh     
My guess is that the positive voltage being supplied to the set of gauges that does not work is from the wrong battery.

Those gauges would not have a ground reference for the 12-volts.

It is just a guess. You can test this theory in ten seconds by connecting a jumper cable between the battery negatives.

Four batteries? How big is this Boston Whaler boat?

HAPPYJIM posted 09-15-2003 12:56 PM ET (US)     Profile for HAPPYJIM  Send Email to HAPPYJIM     
You can NEVER have too many batteries, bullets or beer.
alkar posted 09-15-2003 01:38 PM ET (US)     Profile for alkar  Send Email to alkar     
Jim, thank you for your suggestion. I'll try it when I get home tonight.

To answer your question, I have a 22' Outrage w/ whaler drive and twin Honda 115/130s. I have a pair of group 24s in the transom storage area and a pair of group 27s in the cooler seat forward of the console. It may be over-kill, but we fish well off the Oregon coast, so I have installed redundant everything. I worry less as a result.

lhg posted 09-15-2003 06:11 PM ET (US)     Profile for lhg    
My experience is that gauges work directly off the pre-wired leads in the engine wiring harnesses (at least that's how it is with Mercury). So if the engine will start, and the gauges are properly wired, those gauges should work. Check the tach, ignition and ground leads, & connections, in the key switch harness.

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