Are you sure yer gitting power to the backup lights?

Fer safety's sake, use a 2nd person to help you check power to the backup lights as the engine must be on and running.

If yer not gitting power, it could be the backup switch or the backup light relay. According the FSM, the relay should be located in the left kick panel.

Is this an automatic or manual? If it's a manual, check the backup switch located on the tranny. <img src="/forums/images/graemlins/wink.gif" alt="" />

1998 T-100 Xtra cab SR5 2WD Auto; Roadmaster Active Suspension; Yokohama Geolander HT-S; lowered air dam; full belly pan; 4? diffuser; 11" side skirts; dual transmission coolers; 67% grill blocked; Auto-RX'd; ScanGauge II/Ultra-Gauge