I think you're referring to the 'Converter/Charger' unit - converts AC current to DC to charge the batteries...
1. With the AC OFF - check the voltage using a voltmeter at the battery terminals....
2. Turn the AC back ON to the converter and again check the voltage at the battery terminals - if the converter is working properly, you will see a noticeable rise in the voltage, close to 14 volts...
3. If no rise in the voltage at the battery terminals, check to make sure the heavy fuses in the fuse panel are good, and making contact - you can use your voltmeter on both sides of the fuses to see if the voltage is the same, showing that the fuses are good...
4. If converter is bad, check out the products at Bestconverter.com for a replacement - you can get a modern 3-stage type converter/charger that will help get longer service life out of your batteries...you can call Best Converter, and they will recommend what's best for your AS - they are experts at this stuff, I've bought two units from them, for our TC and the AS!
Ray
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Ray & Pat; Morada, CA
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