Caravan (or any) A/C clutch diagnostics

On my brother's 07 caravan I kept hearing about the blower motor not working, over and over.
He finally brought it to me to check out and I ran jumpers right from the battery, motor worked. Went to blower resistor no power coming in. Swapped heater controls cuz I had another one here. It ended up being a problem with the under hood fuse box, went to junkyard and got another problem finally fixed. (Hey guys do you have a little brother that complains and complains and when he finally brings you his car to find out what's up he brings it over while it's raining?? Mine did)