Trailer battery Wiring to Prado 120 Anderson plug

[Sli21 Lurker Find all posts View Profile Close Sli21]

hi all
i have a 2003 4L V6 with an auxiliary battery on an isolator going to a fridge pint in the boot. I want to add an Anderson plug on near the trailer socket to charge my trailer battery while travelling. I will be running a fridge whilst travelling. Can I come off the fridge point to the Anderson plug? Needing a simple non expensive solution. Didn’t see the need fir a dcdc charger hopefully. The trailer wiring has an Anderson plug fitted near the trailer plug.
many thanks
scott

[sparksy Senior Member Find all posts View Profile Close sparksy]

Depends on the size of the cable from aux battery to the fridge outlet Ive got the same setup currently in my 04 prado. 100AHr aux battery supplying a 100A anderson fitted to towbar. Crimped in with that 25mm2 cable is a smaller 6mm2 going to the fridge socket( anderson 50A)
If the cable that you are intending to use is too small then you will get volt drop and your camper batteries wont reach full charge. Even with the 25mm2 Ive got from aux to camper battery I wasnt getting full charge.
A mate gave me a 20 A Thunder dcdc which I reluctantly agreed to try. To my suprise it works.
Other option is a diode unit to replace the alt sense fuse. Ive not tried one but lots of 120 owners here swear by them.
Link to my install. Since removed the dual battery switch as was getting volt drop across it.
https://www.pradopoint.com.au/forum/...iring-install=