Quote:
Originally Posted by ray_mcavoy
The brown wire is the alternator "exciter" wire. It provides power to the alternator's field windings on initial start-up. Once it's up and running, the alternator's internal diode trio provides the field current.
For trucks without gauges, the "GEN" indicator light bulb is part of this circuit in the cab harness.
For trucks with a factory ammeter (73-75) or voltmeter (76+), the cab harness contains a 10Ω resistance wire (usually brown with a white stripe) that takes the place of the "GEN" bulb. The resistance is necessary to protect the alternator's diode trio and to prevent feedback into the ignition that could keep the engine running after the key is turned off.
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Beat me to it.
I read somewhere the resistance of that wire is closer to 45Ω. I would guess anything close to the resistance of the GEN bulb filament would do the job.
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1959 M35A2 LDT465-1D SOLD
1967 Dodge W200 B383, NP420/NP201 SOLD
1969 Dodge Polara 500 B383, A833 SOLD
1972 Ford F250 FE390, NP435/NP205 SOLD
1976 Chevy K20, 6.5L, NV4500/NP208 SOLD
1986 M1008 CUCV SOLD
2000 GMC C2500, TD6.5L, NV4500
2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263
2009 Impala SS LS4 V8
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