Thanks for the input guys, I guessed I was near the mark with the 50 amp rating, add in the heat of the engine bay and the age of the breaker it was inevitable. It was what I had and it allowed me to get the component positions sorted, and at least start testing, a 60 amp is on order.
I am normally pretty good with dc voltage, but am a little confused as to why a voltage increase would also increase amperage? I get the 'pressure' of voltage but 13.8 was kitchen reading and 14.4 alternator.
I have always considered the reverse for example, a 12v engine coil that has boosted 12v to say 10,000v reduces the amperage right? If not then your going to be in trouble if you get a 10,000v/1000 amp shock, it's the amps that kill right?
Or another example, a 12v starter motor pulls say 150 amps to produce 2.5 kw of power, and a 24v starter uses as near as dammit half the amps to produce the same kw?
