Battery drains are always fun. Generally it means that something you either hooked up recently to a direct hot wire is draining the battery or there has been a wire that got hot enough to melt another wore on the system and cause a full time connection. Other than taking it to the dealer and letting them put a breakout box on your system to isolate the problem, you could put a volt meter on your battery, if there is truly a drain on the system you will see the volts slowly drop, then open your fuse box and one by one start pulling fuses until you find the one that's pulling on the battery, (you'll know this when the volts on the meter stop dropping). When you find the fuse that's pulling the volts down, you'll then be able to start tracing the circuit for that fuse and everything connected to it. It's a PIA but it's something you'll have to do, unless you want to pay dealer prices.
SOURCE: i have a transit van but it doesn't start in the morning/alternat
Do an aquiesent discharge test, using a multi meter set to 10amps disconnect the neg terminal of the battery and put the meter in line, (poss lead to neg of battery and neg lead to neg lead to battery or earth point). there should be very little drain, just the memory for the radio etc just a few milliamps any more like 1 amp or more and you have something like a boot light stuck on window lifter motor stuck on raise etc,, it could also be a duff plate in the battery, get a deep discharge test done at a quick fit place, this will test the battery's capacity to hold a charge under load.
SOURCE: HOW DO I WIRE A 2ND BATTERY ON MY TRANSIT CUSTON 2014
123Mitch eazy ,its called wiring battery in PARALLEL that means positive to positive and negative to negative ,run new wire from old battery to new battery positive, now run a new wire from old battery to new battery negative, that's it. NEVER cross neg to pos. if this helped you please let me know ,good luck .
Woody
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