From my 1998 T-100 2WD extended cab...
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Do you have an alarm system? Remote start? If you do, it could be the cause of yer problems. Check the wiring harness and where it hooks up to the alarm setup very carefully. <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