Troubleshooting Bulldog Power Jack BD500186 that Drains Trailer Battery After Several Uses

Question:

I have Bulldog Power Jack bd500186. It worked good last year but this year it seems to drain trailer battery down after several uses. Doesnt seem to be charging Trailer battery when hooked to tow vehicle. Tow vehicle hooked up using 7 pin connector. what do you recommend checking?

asked by: Chad S

Expert Reply:

First you will want to use a circuit tester like part # PTW2993 to test the 12 volt accessory circuit of your 7-way. There should be voltage on this circuit, if not check the fuses of your tow vehicle as most likely one has blown. This is probably the issue.

If there is voltage there you will want to test the wire that leads to the battery with the trailer connector connected but the wire disconnected from the battery so that you can tell if the voltage on the circuit is coming from the tow vehicle.

You should note that trailer batteries can only be maintained with this circuit from your 7-way. You could also have a weak trailer battery. Most automotive parts stores will test batteries for free.

expert reply by: Jameson C