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My 74 road runner will crank for ever and wont start until i stop and release from cranking it starts. I have 12v going to both sides of ballast what is this issue?

Just bought a new relay thinking that is why my horn isnt working because the old relay was clicking. The new relay was installed and its clicking which sounds like its doing what it’s supposed to but no sound from horn. I tested the horn and it works so what gives? Any ideas??

What is this black wire for? Its on driver side coming out of forward light harness. All my light work as normal. Previous owner just had it sitting there not sure what it connects to?

Can i unplug and throw away my interlock box plastic is crumbly dont want the electric box catching my cab in fire. I want to just unplug it electrical tape the connections and call it a day. Seats and seatbelts are unplug not used and no bypass switch like way it came. just wandering if there...

Why when i press my horn is it able to start my car?!

I cant figure out what these wire connections are for. See pics 1st one yellow line going halfway down fender. 2nd blue and green connector coming out of firewall. 3rd black connection on driverside light area

Can someone just go over the underdash buss terminal #3,#4, and #20 do not have a color assigned to them on the diagram

Fuse block number 2,3,and 4 have power in off, all the others receive power after key is switched to on is this normal? My 1973 duster fuse panel doesnt have any power when key is off to anyfuse. Scratching my head.

I bought a 74 RR restored except the dash items. My tachometer is bouncing back and forth on its own from 3,000 rpm to past 7,000. It does this on its own at idle. It sweeps left to 3000 and back to past 7000 as a constant rhythm. Fuses are good, sending wire is good, could it be a magnetic pick...