electric dummy here I have a 1972 f100 and received the truck not running . I have no power to anything under the dash including the ignition switch . I have power to the one side if the starter solenid that the battery cable connects to. The question I have should I have power on the I post? Is that what supplies power to under dash?

 

Yes,that battery cable is bringing power directly to that terminal. There should also be about three smaller wires that are fusible links mounted to that same terminal. They are what feeds power to the inside of the truck. If they are there they must have been blown. Like someone reversed the jumper cables while jumping it. When they blow, the copper ON THE INSIDE separates like a normal fuse.

 

unfortunately the fordification schematics don't show those wires so it is correct to say the starter solenoid is bad?

 

no. if you have no power into the cab you have either a blown fuse or broke/missing connection. You should have the main + battery cable connected with 3 other wires on the same terminal large terminal. one wire from the ignition to a small post. The large starter wire on the other large terminal by itself. the power for the cab comes off the post the battery is connected to. Start there, and check the wires.

 

Cab power is supplied by a black wire with a yellow trace on the hot side of the solenoid. Check Mr. Fusible Link!

You have a multimeter, right? There is no excuse to not have one.. Harbor Freight has coupon for free ones with like a $20 purchase. I've got five of them... one in each work area, one in a troubleshooter box, one in an electrical tool box, and one in the junkyard toolbox.

 

Most likely the fuse link as suggested. However there is no way we can tell how you are testing. If using the neg battery term as your ground, the neg battery lead could still be bad where it connects to the engine block. Worth checking, if only for good maintenance.

 

Ok thanks I found a 3 wire plug - 1 wire being black/yellow - I connected a jumper from positive post to that wire and YEA I have power - so what does the red and yellow wires go? There must be a harness that plugs into those 3 wires but did not come with the truck.

 

Yep. There's your problem. Find a harness from a donor truck at a local wrecking yard or make one up. Make sure you incorporate fusable links. Available aftermarket or from Ford. I believe they are 18 gauge.

 

ok what are the other 2 wires? the red and yellow

 

 

thanks for the schematics but I think the 67 and 72 are totally different

 

so neither schematic the one above and the 72 don't show the yellow are red wire I presume they go to the regulator?

 

Doin' this from memory but I'm thinkin a yellow wire with a red trace goes to the horn(s)... that's why it doesn't show on the diagram above which is specifically for ignition, starting, charging, & gauges.

 

Here's a couple you'll have to print and put together. Page one.