OK, I just installed an amplifier on my aftermarket stereo in my 87 benz. I noticed that my warning light on my dash for a blown exterior bulb started coming on then turning off. It did that for a few days, only all my bulbs were fine. Then I noticed my headlites seemed a bit dim one nite, then last nite i barely got home they were so dim, and my antilock brake lite came on and stayed on. I put a voltmeter across my battery and got only 7.5 volts with the car running. While performing this test I noticed that like an idiot I had failed to hook up the heavy duty power wire for the amplifier to the positive battery terminal. Instead the ring terminal on the end of the wire was just sitting against the positive battery terminal. So, the amp worked, but I think that by trying to drive a 225 watt x 2 channel amp through this very poor connection, I may have done something bad to my charging system. Any ideas? I put a trickle charger on the battery last nite and it did appear to take a charge. I just tested the battery with the car off and got 13.6 volts. I started the car and tested again, this time 12.7 volts with no accesories on, just the dome light. So, the charging system is nonfunctional. Isn't there some type of low voltage protection circuit, maybe I blew that or fried the voltage regulator or alternator? Please help, I am an idiot when it comes to electricity (in case that's not already obvious)

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87 300D 162,000 miles: It's not just a car, it's an adventure!