a lot of varibles but......

[porgies]

I guess the old time diesels were once you got them runnin you were fine. My newer diesel tractor does operate that way you need power to hold open a fuel shutoff valve thats by the fuel control that is" how do you say" spring operated closed electric current to open.
Ive had to replace the ingition sw once because it was sending the wrong signal.
WRONG SIGNALS: Now there a subject or a forum of its own !!!!!!!

[Isaac Zachary]

Originally Posted by porgies

ive found a 50 amp fuse...
Is that fuse too large for the 4x12 wire and if not it should be as close to the main battery ??? right.

12gauge wire is used in applications from 15 to 20 amps (max, depending on things like wire insulation temps). So times 4 would get you 60 to 80 amps. So 50amp fuse sounds like a very good choice to me.

Originally Posted by porgies

I guess the old time diesels were once you got them runnin you were fine. My newer diesel tractor does operate that way you need power to hold open a fuel shutoff valve thats by the fuel control that is" how do you say" spring operated closed electric current to open.
Ive had to replace the ingition sw once because it was sending the wrong signal.
WRONG SIGNALS: Now there a subject or a forum of its own !!!!!!!

That was my old 1984 VW Golf diesel. It had a solenoid that held open the shutoff valve. That was the only electrical thing needed to keep the engine running.