Add second batery with isolation to Jeep

 

Best way to add two batteries so one is automatically isolated when engine is off but still have a option to unisolate when starting if needed.

 

Example on 1987 Jeep YJ Wrangler

 

Amazon affiliate links to some of the parts I used

Oil Pressure Switch: http://amzn.to/2kMtd0w

Push Button Starter Switch: http://amzn.to/2kVd2AJ

Continuous Duty Solenoid: http://amzn.to/2lNstwu I this gets hot I’ll switch to a 200Amp one

 

Got these at hardware store but for examples

Brass Tee to add second oil presure sending unit:  http://amzn.to/2kAAorO

Brass Nipple: http://amzn.to/2kMg5bX