put a gauge on battery to make sure you are getting voltage then check the two wires for power marked in pic. if no power it may be a connection problem on either end , bad fuse box, also check ground battery to engine. and ground battery to body.
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.