Multimeter set to TWO VOLTS DIRECT CURRENT
Fully Charge Batteries
Start microwaveon high
At each connection such as the battery lead post to battery cable clamp
Put the POSITIVE RED meter probe close side to the battery
Put the negative side on the ADJOINING terminal, post, nut, stud, etc.
RIGHT NEXT TO EACH OTHER
Keeping in mind the meter decimal point what do you read?
WRITE DOWN A LIST of junctions tested and voltage ALL the numbers on paper.
TRANSCRIBE the list of parts and numbers to a separate post on this forum.
The last thing written down is a separate test, stab both lead battery posts with the meter set to 20 volts.
SET THE METER KNOB TO TWELVE VOLTS DC
Then RUN RUN RUN
And stab both terminal POSTS (not the the lugs nor the nuts) going into the inverter. THE THREADED BOLTS THE STUDS THEMSELVES
Write that figure down and include it in your post.
This is the ONLY meaning SINGLE SOLITARY way you are going to find your problem without replacing a whole bunch of stuff.
An IR gun needs to be ONCE INCH NO GREATER distance from a small part to be probed.
