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Old 10-03-2013, 11:46 PM   #18
8lugnutz
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Join Date: Jul 2013
Location: Canton, TX
Posts: 245
Re: Help with identifying something on fuse box

Switched power is provided when the ignition key switch is in the "run" position, but not the "start" position. When your ignition switch is in the "start" position, meaning that you are physically turning the switch all the way to engage the starter, there are electrical circuits that stop providing power. Your radio circuit is one of these, it gets turned off when you start the vehicle. Power is cut on the fuel solenoid circuit in the exact same way, or it was prior to adding the relay. It makes sense to me. Not sure if this is only '80 model or not.
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