No power I pulled the motor out of my truck to put a new crankshaft in it and then when i was finished i put the motor back in and hooked everything back up. now when i went to turn the key to turn the motor over, nothing happened except the battery light comes on. i can even pull the headlight switch and the headlights don't even work. its like there is no power. th dome light works though, but it shuts off when you turn the key to the "on" position. i can't figure out anything else to try.

I think you have little alternative other than to get a bit technical and take some voltage measurements at various points on the battery supply system.

Check that +12v is present at the main fuse/relay distribution panel.

When checking voltages, switch the headlights (or Ignition) alternately on/off and observe voltage remains good in all cases.

When checking these voltages also ensure you check with the negative connection of your testlight (or multimeter testlead) connected to 1) the battery negative,

then

2) the vehicle frame or chassis.

This is to ensure integrity of frame ground connnections.



Follow this test procedure right up to the ignition switch and the headlight switch.



The tests using this method should resolve your problem. I think you have little alternative other than to get a bit technical and take some voltage measurements at various points on the battery supply system.
Check that +12v is present at the main fuse/relay distribution panel.
When checking voltages, switch the headlights (or Ignition) alternately on/off and observe voltage remains good in all cases.
When checking these voltages also ensure you check with the negative connection of your testlight (or multimeter testlead) connected to 1) the battery negative,
then
2) the vehicle frame or chassis.
This is to ensure integrity of frame ground connnections.

Follow this test procedure right up to the ignition switch and the headlight switch.

The tests using this method should resolve your problem.