1974 Duster total electrical failure, followed by quick recovery.
Basic Standard layout is like this.
(Not shown is the '74 seat belt interlock wiring details.)
All the wires connected to the battery positive are always hot.
The fusible link is protection in case a main wire or item shorts to ground, it will melt seperating the battery from the short.
Ground shorts occassional occur in the alternator, when wires under the dash chafe, or wires under the hood get pinched or insulation burned through.
Wires labeled A come and go from the bAttery positive.
Wires R relate to AlteRnator
Q1 feeds the fuses that are always hot.
J1 feeds the key switch.
J2 wires are fed from the key switch run terminal.
J3 is the fed from the start terminal. J3 bypasses the ballast resistor because at start the system voltage is low (10-12 Volts instead of 14 Volts when the alternator is running).
Basic Standard layout is like this.
(Not shown is the '74 seat belt interlock wiring details.)
All the wires connected to the battery positive are always hot.
The fusible link is protection in case a main wire or item shorts to ground, it will melt seperating the battery from the short.
Ground shorts occassional occur in the alternator, when wires under the dash chafe, or wires under the hood get pinched or insulation burned through.
Wires labeled A come and go from the bAttery positive.
Wires R relate to AlteRnator
Q1 feeds the fuses that are always hot.
J1 feeds the key switch.
J2 wires are fed from the key switch run terminal.
J3 is the fed from the start terminal. J3 bypasses the ballast resistor because at start the system voltage is low (10-12 Volts instead of 14 Volts when the alternator is running).
