if its the one with the slide off cover that is your relay.
slide the cover off and check the fuse.
it looks like a strip of alumium held down with 2 screws.
check it and if its cracked get a new one <or 2> . this is an 80 AMP
take the NEG cable off the BATT before taking the screwdriver to it as
it is HOT.
to get it going you can use a heafty piece of wire to get it started.
the case, minus a few cans!