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Help tracing a circuit??

Old 08-25-2011, 02:37 PM
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Default Help tracing a circuit??

Guys:

I just took possecion of my 1989 rampage 28. Shes in impressive shape, over the last few weeks i've trouble shot several very minor issues, a faulty speaker in the stereo, some gelcoat chips, a broken wire to the bilge blowers, the anchor/nav lights being wired incorrectly, new locks on the electornics panel. relabeling all switches, dry cleaning the berth cushion covers etc.etc. I still have a few to go. I have an AC unit that functions ( turns on, seems to cycle the compressor but blows non cold air. a saltwater washdown pump thats non fuctional ( maybe electrical maybe frozen pump...One that I know is going to kick my but is the dome light under the hard top. I have tested the fixture and it works great. I need to test the switch at the panel and the supply wiring and see where the voltage stops.

My question is there an easy way to locate that feed wire? I'm sure it goes thru the square tubing of the hard top and down the leg then up to the panel where it is bundled in the huge mass of wires leading to the abyss,,,

I was hoping for a tester like the phone/network guys use where I can trace this thru the bundle and find its terminal ends easily.

I'm almost thinking running a new run might be easier...

Thanks in advance.

Westie
Old 08-25-2011, 02:57 PM
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this will help trace a wire, not sure if it will work for this application

http://www.datacomtools.com/catalog/...-triplett.html
Old 08-25-2011, 04:30 PM
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It's far more likely that the failure is at a termination, not in the center of the wire run. It will terminate at the fixture and at the switch. There will also be a fuse or circuit breaker in the circuit. Don't forget, the problem could just as easily be in the negative portion of the circuit.

Get a piece of wire and connect it to the battery negative terminal. Now, with the cover off the light and a known good bulb in the socket, touch the other end of the wire to the negative terminal on the socket. If the bulb lights, the problem is with the negative portion of the circuit.

You can do the same test for the positive side but you should have a 10 amp or so fuse in the circuit.
Old 08-27-2011, 09:13 AM
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thanks guys after this storm passes i'm gonna get it squared away.
Old 08-28-2011, 08:29 AM
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Originally Posted by rwidman View Post

Get a piece of wire and connect it to the battery negative terminal. Now, with the cover off the light and a known good bulb in the socket, touch the other end of the wire to the negative terminal on the socket. If the bulb lights, the problem is with the negative portion of the circuit.
Don't you mean if the bulb doesn't light there is a problem with the negative side?
Old 08-28-2011, 08:40 AM
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Originally Posted by MYTraveler View Post
Don't you mean if the bulb doesn't light there is a problem with the negative side?
Nope, you are replacing the negative side of the circuit with the wire.
Old 09-05-2011, 03:20 PM
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was a rotten ground...FIXED.... Thanks for the help

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