Autoelectrics are a wonderful thing. Sounds like something isn't wired quite right. Reckon you're onto it re-doing the second battery system.
FWIW checking your voltages without load across...
Type: Posts; User: 0-TJ-0
Autoelectrics are a wonderful thing. Sounds like something isn't wired quite right. Reckon you're onto it re-doing the second battery system.
FWIW checking your voltages without load across...
I honestly don't know specifically. Odd electrical issues can regularly be traced to earthing problems. If it were me I would run through the engine bay, disconnect and clean all the earths you can...
Earthing issue is my bet.