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10 – Instrument cluster pin #7 back to GEN2 relay 24v input – 1 BRN/RED 920. Diagram E-9 11 – GEN2 relay to the GEN2 Diode under the dash cover, 1 BRN 25Z. Diagram E-9 12 – GEN2 Diode to the firewall plug 1 BRN 25Z (not labeled in the diagrams). Diagram E-9 13 - Thru the firewall plug 14 –...

Figured it was time to complete the GEN2 portion GEN2 is a little more complicated. It has both a 12v circuit and a 24v circuit. The 12v circuit energizes the GEN2 relay when the key is on and the 24v circuit send power to the alternator exciter plug. Lets work on the 12v side first. 1 – From...

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Here is a Service Bulletin that help explain how an alternator works. It is not for the 'Isolated Ground" units we use but covers how they work. The "lamp" will be on when no power is being generated and "excites" the windings. The "lamp" will go out indicating that the alternator is producing...

READ the first few pages of the Troubleshooting Section of the TM 9-2320-289-34 Tech Manual. It explains how to read the wiring diagrams. GEN1 Sometimes the TM wiring diagrams don't post all the circuits. The GEN1 exciter circuit is one of those. The GEN1 exciter circuit is controlled by the...