its ok now, found a 180A one for £11 new

when charging at high currents though the cable and relay need to be able to cope.

been recommended to use 2 or 0 awg wires between the two batteries on a car audio forum site. could get away with 4 awg, but i'd rather be on safe side

mine came as a whole kit from autoleads, including the cables, inline fuse holder, fuse and relay, it was about £35 i think. THe cble between the batteries only carries the charging current from one battery to the other, not the current that the amp draws, thats why you can get away with a higher AWG and a smaller current.

cheers mate, thats more or less what i'd got, but i had a seperate witch after the relay instead of on the relay signal line, yours is a better idea :thumbs:

surely you'd want at least 4awg cable between the batteries tho?

my only other question now really is where can i get these split charging relays from? do they have two main terminals capable of fitting 4awg/0awg??

Ignore the amp ratings, that was just me trying to sort out my system, but that is the basic diagram.

right, planning on doing my install this summer, got a yellow top on the way (cheers corb :thumbs:.)

been trying to find info on a split charging system, but not found anything of much use really

one american site was talking about having a 2nd high rated alternator. i know i'll have to be upgrading my alternator, but this was talking about having 2 alternators, with the high rated one just for the audio battery

is this feasible? if so, how would i fit it?

if i were to use just one alternator, can i just wire both batteries up to the alternator? or do i have to buy some switching circuitry so the alternator is only ever charging one of the batteries at a time?

cheers :thumbs: