I replaced the serpentine belt of my wifes 05 Sequoia and when done the truck would not crank, no clicking sound from the starter relay but all dash lights are working. I tought it was the alarm system because my wife told me it happened to her before and she just tried arming and disarming the truck, started after the third try. I check the fuses and relays in the engine bay and the driver side kick panel and all were working. I was able to turn the engine when I trip the starter relay but car would not start so contact from relay to starter is good and starter is also good. I then bypass the alarm system starter kill relay and still no click and to crank. While at the alarm starter relay I was able to check that 12 volts is being sent from the ignition key when turned to start. This is where I stoped trying to figure out the problem the black wire from the ignition key goes behind the steering column with the rest of the ignition wires and it was sending a 12 volt signal but it was not reaching the starter relay. Also tried replacing the battery for what its worth.I have been loosing hair trying to figure this out can someout help.