Can’t start ?
1975 wiring has some unique circuit arrangements.
One important option that is critical to know is whether the car was originally equiped with a defrost grid for the rear window. Those cars came with a heavy duty alternator and battery wiring arrangement. One clue will be the rear window itself and/or the switch to turn it on. The other clue will be a grommet in the firewall with some large wires.
A pdf of the '75 valiant/dart wiring diagram from a service manual in this post.
Here's the general concept for the main power feeds.
A1 is Battery feed.
R6 is alternator feed.
With the key off, everything connected to the battery positive is still hot. Take your finger and follow the wires from the battery positive. The ammeter is just another section of the line. Nothing magical happens there, its two studs and a big metal plate that electricity can flow through in either direction. The color change is so the hookup is correctly done. That way the needle will point the correct way when the battery is discharging or charging.
Some '75 model year cars still got the '74 seatbelt interlock.
Hopefully your does not have that, but if it does, then it must be dealt with.
Key in accessory positio n, there should be power for turn signals, heater fan, etc.
Key in run, should have provided power to the blue or blue and white wires at the ballast resistor.
The engine year in this case is not too important.
1975 wiring has some unique circuit arrangements.
One important option that is critical to know is whether the car was originally equiped with a defrost grid for the rear window. Those cars came with a heavy duty alternator and battery wiring arrangement. One clue will be the rear window itself and/or the switch to turn it on. The other clue will be a grommet in the firewall with some large wires.
Exactly.
A pdf of the '75 valiant/dart wiring diagram from a service manual in this post.
Here's the general concept for the main power feeds.
A1 is Battery feed.
R6 is alternator feed.
With the key off, everything connected to the battery positive is still hot. Take your finger and follow the wires from the battery positive. The ammeter is just another section of the line. Nothing magical happens there, its two studs and a big metal plate that electricity can flow through in either direction. The color change is so the hookup is correctly done. That way the needle will point the correct way when the battery is discharging or charging.
Some '75 model year cars still got the '74 seatbelt interlock.
Hopefully your does not have that, but if it does, then it must be dealt with.
J1 is the power feed to the key switch. If the large wire (red with white stripe) to the column connector is hot, then there ought to be power to the headlights, brake lights and dome lights.
Key in accessory positio n, there should be power for turn signals, heater fan, etc.
Key in run, should have provided power to the blue or blue and white wires at the ballast resistor.
