instrument guage lights

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instrument guage lights

Postby drbob262 » Wed Dec 02, 2009 12:33 pm

We have a 2001 DeFever 44+5 CPMY. The boat has two helms and twin engines. The instrument panel contains small round VDO guages for the temperature, oil pressure and volt meter for each engine. When I turn the panel switch on to start the engines, these instruments have internal backlighting that comes on. The lighting comes on for all stations except the starboard side lower station. Starboard side works fine on the upper helm.

These guages also contain warning lights and one has an alarm and they work fine on all stations including the lower helm starboard. Any ideas?

Thanks, Bob
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Re: instrument guage lights

Postby elnav » Tue Dec 15, 2009 6:13 pm

Instrument back lighting is usually handled by daisy chaining individual bulbs together at the back of a panel. this what I assume you have given the description of round VDO instruments. It could be a loose wire on the ignition switch. Lights are often connected to a terminal on the switch that goes active when switch is not in Off position. If you have a separate switch it may have a fuse in series from the DC power supply bus.
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Re: instrument guage lights

Postby boatguy1 » Thu Dec 17, 2009 12:36 pm

Light bulbs do burn out, have you checked that?
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Re: instrument guage lights

Postby capn chuck » Thu Dec 17, 2009 1:35 pm

Although the likely hood of all of the bulbs burning out is remote it is possible. A good place to start is a loose or missing ground since they are daisy chained as Arild stated. We are rewiring our panels, both at the flybridge and lower helm. I am running a separate ground from each instrument to a ground buss and doing the same fore the positive connection with the positive bus wired to the ignition switch. This has much improved the performance of the instruments and if one goes out I can troubleshoot that one gage. Chuck
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