big volts

i drove this car to work occasionally (65 mi) last year. first time i left the house the headlight switch went south. but never any electrical problems after.

I put a " reconditioned " battery in it other day, but havn't been anywhere.(SUSPECT!???)

when I saw these volts, I cleaned the firewall at the VR and back of it, cleaned the batt --- to engine block and rad support, and added 10 gauge wire from eng to f irewall! ( only reason if was even checking volts here was to get some figures to help diagnose another car with "problems"! LOL

after supper, I will switch batteries. if no change I will tomorrow set out to do all the checks you included. No ONE ever said anything is easy!!??? LOL

thanks for the input..