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Help...Weird electronics / power issue

Old 10-24-2011, 04:41 AM
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Default Help...Weird electronics / power issue

Ok,... so everything works fine on my dash panel (gps, stereo, sounder) Until... i hit the trim tabs and the sudden draw shuts everything off. At this point nothing will turn back on (once in a while the gps wil restart automatically.) Yesterday i had just the gps on and when i turned on the FF it killed the gps. Again this just applies to my dash panel. My toggle switches below the helm (nav lights , bilge pump, washdown etc are NOT affected.)

Obviously the bus that feeds the dash is the logical place to look but what should i look for? Besides loose connections im not good at troubleshooting elec problems. Yes i checked batt connections, they are clean and tight. Both batteries were replaced this spring and they crank the motors fine.

The bus that feeds the dash LOOKS clean and doesnt have green corrosion. I checked and all the individual phillips head screws for the electronics and theywere tight. Should i remove all connections and wire brush them all to start??? I did NOT remove the hex head connections at each end of the bar (larger gauge black wire). I believe this is the ground?


Boat is a contender


thanks
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Old 10-24-2011, 05:52 AM
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Obviously the bus that feeds the dash is the logical place to look
Not really. Not unless your trim tabs receive their power from that bus.

The voltage drop is caused by the current draw of the tab pump so the problem is in any circuit(s) common to both the tab pump and the buss that feeds the dash.

Remember, that current flows through both the positive and negative side of a circuit so any drop could be in either side.

And - if you don't know the difference between the positive and negative, you may make matters worse by fooling with it. Get some qualified help.
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Old 10-24-2011, 10:42 AM
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The first thing i would check would be the ground connections. Then check fuse/ power connections at all locations including the batteries.

Let us know what you find.
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Old 10-24-2011, 10:48 AM
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Also, to check if that is the ground bar you are describing test it with a test light or multi-meter. Place the pos lead to the pos battery post and the neg lead to the ground bar you are describing. Also, check where the wire feeding that bus bar is connected. This problem most likely is connection related, you just have to find that connection.

Do the trim tabs work without problem? What kind of TT's? Lenco or Bennet?
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Old 10-24-2011, 03:13 PM
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Bennett tabs. Like i said i had the plotter on yesterday and turned on the FF and the draw of the ff killed everything. This issue seems to have gotten worse over the summer so im pretty convinced it is corrosion related. Ill report back when i get to look at it. Thanks for the help.
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Old 10-24-2011, 04:15 PM
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Have you load tested the batteries? All the advice above is correct. You either have a bad (or corroded) connection somewhere (Battery terminals, ground block, circuit breakers, etc), or you have a bad/weak battery.
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Old 10-27-2011, 04:24 AM
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Update... Found it! one main connection at the end of the bus bar had a slight coating of corrosion when i disconnected it. Didnt look bad at all (almost waxy subatance) but i cleaned it up and put it back. Everything works perfect. Guess its time to take all connections off, clean and spray some corrosion guard.

Lesson learned here is it doesnt have to be all green and nasty to cause a problem.
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Old 10-27-2011, 06:28 AM
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Lesson learned here is it doesnt have to be all green and nasty to cause a problem.

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