Quote:
Originally Posted by WestyManBC
Anyone know the best way to wire up a solenoid on a 2003 Ford E350 ? I am not sure where or how to wire in my trigger wire from the fuse box to the solenoid. I took a look at the fuse box inside the van under the steering wheel but have not spent the time to see how I can actually access it and add a trigger wire. I also noted there is another fusebox inside the engine compartment for larger loads, maybe one can wire into this somehow. Basically need a trigger to turn on when ignition is on to open solenoid. Thanks
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I've got a 2009 and the wiring diagram book. On mine, there is a Smart Junction Box under the hood. I would use SJB fuse F42 (upfitter switch) or F44 (Aux battery diode). Don't know if 2003 is the same. There is another box under the hood called Battery Junction Box which has bigger fuses and relays.
However most vans use an RV-specific voltage sensing relay to separate the batteries, which should prevent the house battery draining in case of alternator failure. Typical brands are Sure power and Blue Sea. Make sure to fuse the house battery charging wire!
AND maybe check to see if it already has an aux battery... It would be on the frame rail under the side door step. If so, it already has an aux battery fuse and solenoid. Mine did, but they were 50 amp which could be light with a big house battery bank.