I have discovered a problem with the charging circuit. When there is no electrical load such as headlights, A/C etc the charging circuit is mostly off. Battery voltage shows 12.5 volts. turn on the headlights and it goes to 13.8, same with A/C. with every accessory turned off I get under 12 volts to the radio and amplifier when transmitting. Turn headlights on and I get 13.5. How can I get the truck to detect the load on the radio power cable?
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