All "modern" cars ( ~ 65 up ) in general have a self resetting circuit
breaker built into the headlight switch. This is a safer alternative to
fuses since they reset automatically.
Circa 73 many cars ( in general) were equipped with fusible links on the main
branches of the electrical system. Usually there are 3 main branches
1: Constant battery power ( headlights/brake lights/ lighter)
2: Switched power ( through the ignition switch accessory terminal for
Wipers/Heater/turnsignals)
3: Charging system ( from the alternator B+ terminal)
The main branch is where all of the positive wires get power from the
battery. This point is at the starter solenoid or a separate wire from the
battery terminal. These fusible links are there to prevent a catastrophic
melt down, sub circuits still need fuses.
Fusible links are great since they can be added to a harness without
affecting the look of the car. Don't hide them under the harness covering,
let them come outside to allow inspection. The insulation is designed not to
melt if the link blows so stretching the wire is the only way to spot a
failure.
Harold
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