
Originally Posted by
IdahoScrapper
Which part? Draining the battery? Wire in a 2nd battery and put an isolator in. Refer to link I just posted.
Isolation Switch. protects main battery from draining. If you tow an RV your truck maybe already equipped. The wiring schematic will vary from the one below to keep the trailer battery isolated from main.
To get a picture in your minds eye, replace inverter with trailer battery which is only present when the trailer is hitched and plugged into the trucks brake and marker lights which also has a charging circuit which includes and isolation relay.
2nd battery does not have to be mounted under the hood, I used this same circuit to keep my
winch battery fully charged on my car hauling trailer. The battery is located on the tongue near the winch.
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