I have a break in one of my wires in a wire harness in my combine. Ran a jumper wire out of fuse box to get by for harvest.thought my non contact ac dc would work but it doesn't detect 12 volt dc any suggestions so I don't have to cut open the entire wire harness and replace the wire thanks bill
- Thread starter chcase
- Start date
Janicholson
Well-known Member
If you know which circuit it is, and what color and connections it has, go 1/2 the way to the device it connects to and strip the loom and check for conduction by poking through the vinyl insulation on that wire. if none, go 1/2 the way to the source again and strip and check. you will find it rapidly that way. Once found, and repaired with solder and shrink tubing, put "liquid electrical tape" on it, and when dry, wrap it with shrink wrap electrical tape. Jim
Rick B 8N WA
Member
HF has a tone tracer set for under 30 bucks. Very sensitive. Better than a more expensive unit I used on telephone and network wiring.
Steve@Advance
Well-known Member
It is very unusual for a wire to break in the middle of a harness with no evidence of external damage.
Look for the obvious first, check any plug together connectors, terminal ends, any place the wire may have detoured to another connection, safety switch, etc.
Look for the obvious first, check any plug together connectors, terminal ends, any place the wire may have detoured to another connection, safety switch, etc.
My first thought was a mouse had gnawed on the wire harness.no signs of that I have another line with the same problem.they are not on the same fuse the fuses are good and I have stuck the wires leading away from the fuses and show there is 12 volts there.doesn't seem to have any plugs or slices in the harness.just hoping to narrow it down without having to open a lot of the harness
Determined
Well-known Member
Not uncommon to see people get fooled by a meter or test light telling them that they have voltage on a wire yet the circuit does not operate what it feeds to.
A loose, corroded or marginal connection, often at the fuse box will present like this.
Something that draws some amps will give you an answer if this is the case with your machine.
An old style 1157 taillight bulb with leads on it will usually provide enough draw to test most circuits.
Higher amp circuits can be load checked with an old headlight bulb.
A loose, corroded or marginal connection, often at the fuse box will present like this.
Something that draws some amps will give you an answer if this is the case with your machine.
An old style 1157 taillight bulb with leads on it will usually provide enough draw to test most circuits.
Higher amp circuits can be load checked with an old headlight bulb.
Geo-TH,In
Well-known Member
Steve,
I agree, it rare to see an open in a wire. Only seen one open. Like you said, I've seen many problems with switches, electrical plugs, and inline fuse holders. This past year I had 6 electrical gremlins, all because of old rusty, burnt out connections.
First thing I do is look for signs of heat stress at connectors.
Then for no apparent reason, I lost two thermal fuses on same day and heat wasn't the reason. Gremlins again.
My theory:
If you don't have a plumbing leak today, wait until tomorrow.
If your roof isn't leaking today, there is always tomorrow.
If you don't have a hydraulic leak, just wait for tomorrow.
Get my theory. My theory can apply to many things, just wait for tomorrow.
geo
I agree, it rare to see an open in a wire. Only seen one open. Like you said, I've seen many problems with switches, electrical plugs, and inline fuse holders. This past year I had 6 electrical gremlins, all because of old rusty, burnt out connections.
First thing I do is look for signs of heat stress at connectors.
Then for no apparent reason, I lost two thermal fuses on same day and heat wasn't the reason. Gremlins again.
My theory:
If you don't have a plumbing leak today, wait until tomorrow.
If your roof isn't leaking today, there is always tomorrow.
If you don't have a hydraulic leak, just wait for tomorrow.
Get my theory. My theory can apply to many things, just wait for tomorrow.
geo
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