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Quote:
Originally Posted by chev-obsession
VetteVet,
The black wire with fusible link in your diagram, is that the factory wire that connects to the junction block on + battery terminal and feeds the ammeter?
Because the way I read the factory service manual wiring diagram, the black wire feeds the ammeter and brown wire comes out of the ammeter and goes to the alternator?
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Yes the black on the top feeds the ammeter via the dash plug at the 12 terminal and the lower one shown as white feeds the ammeter on the other terminal via the dash plug at no. 1 terminal. They both have inline fuses (4 amp) and they are both positive polarity.
The brown wire goes to the firewall block then to the ignition switch for key on power and connects with the accessory terminal 12 gauge brown wire shown below. The brown wire feeds the fuse panel key on side, heater switch, wiper switch, turn switch, etc.
NOTE: the brown wire to the firewall block converts to a 22 gauge brown/yellow stripe resistance wire (10 ohms) for the alternator exciter and it mirrors the charging light wire in the idiot light dashes. The factory used it as a backup in case the charging light bulb fails. They used it solely, in the case of the gauge dashes which you have.
You already know this but the viewers may not . the brown wire to the firewall plug originally went to the externally voltage regulator and continued on to the alternator as the white wire. the blue wire with it continued from the EVR to the alternator and served as the voltage sensor for the EVR and the field voltage for the alternator. What we are doing is merely using the brown wire as the exciter and the red wire to the alternator as the sensor/field strength wire for the alternator.
