Originally Posted by Fredvon4

Climo

Open your glove box all the way so it swings down to the floor. Look directly up and remove the cover on the black box. There are some fuses and relays for the upfitter control box there.

In your owners manual is info on exactly what positions the four upfitter fuses have in the Mian Circuit panel fuse block.

Be sure to not have more than 8 amp continous draw on either of the two small upfitter wires and no more than 22 amps continous on either of the two heavy upfitter wires.

Yes they are MAX rated at 10 amps and 30 amps but you need some over head to prevent blowing fuses and relays.