Why is my horn starting my 74 road runner

[Nacho-RT74]

This is 73, which is diff from 74 BUT, colors are the same So posting to use it as colors guide

74 gets two yellows for the starter relay circuit… on cab one of them is traced black… one of them comes straight from ign switch, the other one comes from seatbelt interlock control box. Can’t recall at this moment which one is the one traced. But reversing these is not a big problem. The only deal is you would be bypassing the starting interlock system, just like pressing the reset button.

But get the right harness would be the correct procedure.

 

[71Beeper]

Nacho- do you have a bulkhead diagram for 1971 Roadrunner?
And, are they different to the 1973?

 

[flamesoldier]

Update***** fixed everything thanks to nachos wiring, previous owner had a few wires mismatchdd based on 73 thank you 74 souch different, horn relay needs to be preplaced as the relay is making a clicking noise obviously nit allowing the connection to the horn.

 

[Beekeeper]

Update***** fixed everything thanks to nachos wiring, previous owner had a few wires mismatchdd based on 73 thank you 74 souch different, horn relay needs to be preplaced as the relay is making a clicking noise obviously nit allowing the connection to the horn.

If the horn relay is clicking it’s possible that it’s ok. Make sure the horns are grounded properly

 

[flamesoldier]

If the horn relay is clicking it’s possible that it’s ok. Make sure the horns are grounded properly

I have only one horn on 74 road runner correct?

 

[QuickBpBp]

I have only one horn on 74 road runner correct?

If a real road runner then Yes..

 

[flamesoldier]

If a real road runner then Yes..

Yes Real road runner, i have this loose black wire near driver headlight area its long any idea what it is for

 

[QuickBpBp]

Yes Real road runner, i have this loose black wire near driver headlight area its long any idea what it is for

View attachment 1408219

Couldn't tell you but was it an a/c car?

 

[Nacho-RT74]

Nacho- do you have a bulkhead diagram for 1971 Roadrunner?
And, are they different to the 1973?

Not the bulkhead like the ones posted, but the full diagram for Charger at least (which should be pretty much the same for bulkhead section to Plymouths)… is a bit small but can be read. Will post tomorrow. I’m not at my PC right now.

all 71-74 are different in some form even on small details. The closers are 72 and 73 between them.

 

[Sparky Anderson]

If you have no luck, let me know I can send you a good colored wiring diagram copy.

 

[kiwigtx]

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

That sounds like a great idea for an Anti-Theft device.
The last thing a thief will do is go sounding the horn while trying to steal the car.

Any chance that the wipers operate when you hit the dip-switch?

 

[flamesoldier]

If you have no luck, let me know I can send you a good colored wiring diagram copy.

Would definitely like that i just order a 1974 FSM hoping it helps too