Kill switch

[LRPorter]

I want to replace the old bargman 7 pin with a new one. I do not like working hot. How can I shut power to 7 pin trailer connector so I can remove old one and install new one?

[aftermath]

Remove the Battery.

[vswingfield]

Disconnect the battery or batteries. You didn't say whether you were replacing the one on your trailer or tow vehicle, (I'm assuming the trailer) but it will work on either.

[Jammer]

The safest way to do it is to disconnect and tape the negative terminal from all batteries that power the trailer or tow vehicle, depending on which connector you're working on.

By disconnecting the negative rather than the positive you would avoid the possibility of creating fireworks by inadvertently touching the wrench to ground. It's important to tape or otherwise secure the negative battery cable, once disconnected, so it cannot touch the battery terminal.

[ck21084]

I agree with Jammer. I was re wiring the main connections in the trailer and used newer car audio style distribution blocks that use Allen keys to tighten the lugs. I was working hot and you would not believe the sparks and heat the Allen key created in seconds when grounded out. I was able to remove the key after burning my hand using pliers.

[TG Twinkie]

Along with disconnecting the battery(s), you should unplug or turn off the converter. The positive side of the converter is connected to the house battery and the wiring is also connected to the charge line.
If you are just replacing the plug ( connector ) on the umbilical cord and are using a plastic connector just connect the trailer ground to the connector last. Cover the end of the wire with tape as well as the shaft of the screw driver.

[LRPorter]

Many terms that are not straight in my mind i.e.

umbilical cord ?

shore power

7 way flat pin trailer side - is what i was asking about.

I think the advice is to

1. unplug shore power

2. disconnect battery by removing and securing positive connectors on batteries - I have two batteries.

3. do nothing to kill switch located behind couch or at other places.

For me this begs the question why not just turn off the kill switch. I do not doubt the advise but I am not sure what the kill switch is for. I recall that somewhere i read to be careful when storing for long periods of time.

[Jammer]

Umbilical = cord between trailer and tow vehicle

Shore power = cord between trailer and power pedestal at campground or outlet on the side of your house or whatever

You will want to disconnect the negative connectors on the batteries, not the positive.

The wiring varies however on many trailers (including mine) shutting off the "kill switch" does not disconnect power to the 7-way connector. The "kill switch" is useful for being sure that no 12v power is being used in the trailer during storage, and is useful for maintenance on most of the 12v system, but it does not disconnect the batteries from the converter or the 7-way.