by ake » Thu Oct 03, 2013 6:50 am
If the front battery is totally dead then there won't be enough power to wake the ecu up, however that's fairly unlikely.
If they were in parallel the front battery would be pulling the rear battery down, and the van probably wouldn't start, that's why they are separated, so that in theory the rear battery always has enough charge to start the van, although under normal circumstances, ie both batteries fully charged, they are connected together at start up, so both start the van!
Yes the connection points behind the seat are fed by the front battery, and are live all the time, so bypass the battery save relay. If you can't get to them from behind the seat, although it can be done, you can remove the batteries, and remove the pre fuse box, connect the new cable, then reassemble, sounds a pain, but in reality will take less than an hour!
Ford Transit Custom 280S Trend 105ps
Does this train stop on Merseyside?