- Joined
- Jul 10, 2011
- Messages
- 2,056
- Reaction score
- 605
- Location
- Germany, Southwest, Black Forest
- My Car
- 1973 Ford Mustang Mach 1 T5 Q-Code 4-Speed
At the moment I restore the wiring of my once disappeared hood lamp out of 3 original harnesses. By tracing the original harness and it's routing (15A669 Assy) I discovered a second wire in parallel, yellow, which is winded together with electrical tape, all original. So there is something special going on. By studying all possible wiring diagrams from 71-73 and my car, I came to the conclusion, that this is a separate 37 Y wire, which comes directly from the heated backlite relay. All other wiring was clear before, because my car has also Convenience group, Tach and Gauges. Studying the 1973 wiring diagrams they say that the circuit breaker of the 15A669 assy should be connected to the positive post of the starter relay. The yellow wire from the heated backlite could be attached either to the same positive post or to the junction block.
Now my question is: in the past it was the common view, that a car which has Convenience group, Heated Backlite and more AND Gauges, the black wire with the 20 AMP circuit breaker has to be mounted on the junction block. Otherwise on the relay post. The original wiring diagrams for 1973 say something different. So what should I do? Follow the '73 wiring schematic? I know the '73 Mustangs, more the later ones, are different animals. So the above said sounds some kimd of logical. But what's the purpose of the junction block? Is it nothing more than an outsourced positive post for the starter relay? That said if the positive post of the starter relay would be long enough I could also fit every wire from the junction block to this connection?
Any help would be appreciated!
Now my question is: in the past it was the common view, that a car which has Convenience group, Heated Backlite and more AND Gauges, the black wire with the 20 AMP circuit breaker has to be mounted on the junction block. Otherwise on the relay post. The original wiring diagrams for 1973 say something different. So what should I do? Follow the '73 wiring schematic? I know the '73 Mustangs, more the later ones, are different animals. So the above said sounds some kimd of logical. But what's the purpose of the junction block? Is it nothing more than an outsourced positive post for the starter relay? That said if the positive post of the starter relay would be long enough I could also fit every wire from the junction block to this connection?
Any help would be appreciated!