Crazy Gauges
Ok, I have a 1995 Mariah Z202 Shabah and am having some issues with my gauges. Sometimes they will work fine, but most of the time they will sweep over and read their maximum as if they were getting too much voltage. I assume they work by reading variable voltage sent to them from a sending unit, but I can't figure out why ALL of them do this at once. I'm starting to suspect it to be a ground wire touching a hot wire somewhere and backfeeding them. I think this because there's also 3 of my rocker switches light that light up faintly when this occurs and sometimes if I blip the throttle it will correct and as soon as the lights go off the gauges are working. I'm assuming the throttle jars something apart.However, if they are working, they just randomly go back to doing the same old thing again. Does anyone have any ideas? I'm on lunch break from work right now and am going to get back after it with a multimeter after I get off.
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Re: Crazy Gauges
Thanks. I will do that first thing tomorrow.
After working on it for about 3 hours this afternoon I have more information. The very strange thing is that the main power distribution block under the dash shows a normal 12.5 volts with the key off. When I turn the key to the "on" position, it drops to about 7.5v. I haven't got a chance to check it while the gauges were working correctly for comparison, because they only worked for a bit when I first started it this afternoon and haven't worked since. It shows 7.5 volts with the key in "on" position with the engine running or off. I checked everything back at the battery and it's getting 13.5+ volts while running from the alternator, so everything is good there. Is it normal for the gauges to peg when the key is turned on before starting? I never noticed before. |
Re: Crazy Gauges
Ok, taking a break to find a 5/16th" wrench and cool off. lol I have determined that this problem is isolated to the gauges and when it occurs it drops the voltage to everything else in the front of the boat. I unplugged the harness that only feeds the gauges and all other voltages are normal. I cut the power and isolated it from the rest of the boat. I then hooked a hot wire to the hot and poof. They were wacky just like normal, however the voltages were normal everywhere else. I went through and clipped the sender wires one by one and am hooking them up one by one. However, I noticed with the sender clipped, the oil pressure gauge still pegs. I am looking for a wrench to unhook the common power to it to see if it is the problem. The common ground on all the gauges just runs the lights in the gauge, but I clipped it just to be safe. They still do the same thing without it. This has been such a pain. I've been all over this thing trying to fix this.. Phew!!
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Also the lights on the guages should not be on unless you have your navigation lights on. If they are, I am positve you have a ground issue, or if you have had to replace any guages, maybe they are hooked up backwards. The only other thing I would look at/try is to see if your trim sending guage is causing problems. The trim sending unit wires often corrode and short, which could cause some issues, but I still don't think that is what your problem is. If you're in Colorado, you can always bring it to my shop. I specialize in these issues. |
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