Installing Trailer Batteries
For those who have taken the battery out of your trailer and now wish to put it back, this information off the net might just help!
Remove The Negative Cable First,
Re-connect The Negative Cable Last:
Why? Because the wrench or socket is touching the live part of the electrical connector. There is a good chance that the wrench or socket handle will accidentally touch something. The entire trailer/car is connected to the negative terminal.
If your wrench is on the positive terminal and it accidentally touches anything metal, you will short circuit the battery. The voltage isn't harmful, but the sudden unexpected sparks will startle the **** out of you, and could even burn you. There is so much current (amperage) available that your wrench literally becomes an arc welder.
If you disconnect the negative cable first, and reconnect it last, then the trailer/car is not electrically connected to the negative battery terminal. After that you can disconnect the positive battery terminal with minimal risk, because if your wrench touches any metal parts of the trailer/car there is no complete circuit, and nothing happens. The only risk comes from touching the other (i.e. negative) battery terminal.
While connecting or disconnecting the negative cable, you don't need to worry about the wrench touching metal parts of the car, because everything is at the same electrical potential. You only need to keep the wrench from touching the positive battery terminal. That's easy.
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2012 Cougar TT, 24RKSWE, 27'
2012 Tundra 4.6V8, 2wd, dbl cab
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