Finding an ignition source connection for Dual Battery System

Howard T
There will be a wire which become 12v "live at the wiper motor when the Ignition is ON. Can't tell you which colour but it is easliy found by probing the wiper plug with a multimeter set on 20v DC scale or a simple test light. If the wire becomes live when Ignition is on, then that will provide a 12v system signal for your dual battery system, which I presume is a DC DC unit near the battery.

You will of course require a heavy cable to supply the charger unit with a 50 amp capacity. Fuse at battery.
If using the chassis as the negative return, then the negative to chassis connection should be bared to metal and sprayed with a body wax or sealant after bolting it there. That stops corrosion action which can cause loss of connection integrity and heating at that point along with a high resistance becoming a problem.



The rear loom going to the plug for the towbar loom has a Pink wire inside which supplies the system voltage to the relays for L and R flasher wires in the trailer loom. I think it is live all the time for Hazard use/ trailer reasons, but if it is only ON when the engine is running then that would be a place to attach a splice for the DC DC unit Blue signal.

Power outlet in the glovebox

Howard - "Philby", the bloke with the first post in the forum link below, has the answer for you.

2017 D-Max - picking up an ignition source

Cheers, Ron.

Hi
I would really like to thank everyone who replied to my help request.
Thank you. It was very helpful.

HowardT

We used this piggy back fuse for our connection for Redarc switching wire. Means you don't have to cut exisitng wires.