Technical Fiat Solifer-Ducato 1989

[Heikki]

Where can I find the D+ signal for double battery installation. Is it on a relay box somewhere? Or maybe a fuse box? Or somewhere with a connector in the cockpit?

 

[Communicator]

Where can I find the D+ signal for double battery installation. Is it on a relay box somewhere? Or maybe a fuse box? Or somewhere with a connector in the cockpit?

On the alternator where it will be the smaller wire. Or more conveniently somewhere between the alternator, and the battery/alternator warning lamp on the dash. Please note that the other side of the warning light is connected to the ignition switch.

I hope that I have made that clear.