I would check both of the fuse blocks, dirt can get in the contacts of the fuses and cause problems. Clean them out and make sure they aren’t deformed. Can use small flat blade screwdriver or needle nosed pliers to bend them some. I use dielectric grease to keep the crud out, but depending on how you wheel the beast, they need attention from time to time. I haven’t had problems with the plastic (molex style) in-line connections of the wiring harness, but I did clean them and apply grease when I bought it years ago.