1970 C10 Battery/Alternator/External regulator issue

[broberson]

Love the diagrams! Once the brown wire hits the firewall on the top one, where does it connect to?

[VetteVet]

Originally Posted by broberson

Love the diagrams! Once the brown wire hits the firewall on the top one, where does it connect to?

It goes to the inside of the cab to the key switch as a resistance wire for ignition power to excite the external voltage regulator/or to the alternator internal voltage regulator, if you have converted.


See the arrows. it is the 24 gauge wire that shares the accessory terminal on the key switch with the large 12 gauge brown wire.




In case you were wondering, the purpose of this wire is provide a 10 ohm resistance to the diode trio in the alternator to protect them from too much current, and to prevent current feedback to the key switch when the key is shut off, which would keep the engine running. It is a backup for the charging light in trucks with the lighted dashes, in case the light bulb burns out.

[Andy4639]

Thanks Vett I wasn't sure about it going to the key switch.