On my Tuscany I simply pull the green wire off the BIRD and this forces the trombetta to open up isolating the two battery banks. So the full charging current of the 100 amp Magnum goes to my bank of 3 series pairs of GC2 batteries. Works well and does not require any extra wiring or devices. The BIRD has a spade lug with the green wire carrying only the coil power of the relay. Incidentally, i replaced the Trombetta with a White Rodgers 200 amp solenoid that has much lower coil current. Nearly an exact replacement for the powe hungry Trombetta.
__________________
|