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A faulty alternator would affect everything electrical while the engine is running. This doesn't sound like an alternator problem.
There are a few fuses I want you to check for voltage when this problem is occurring, the fuse #29 and fuse #34 in the battery junction block, under the hood.
Also fuse #1, in the same block.
You are going to have to charge that battery overnite at 4 amps.
Did you check for voltage at those fuses?
likely or not likely cause you said not likely.
I would charge it and then take it in and have it load tested before buying a new one.
I have a Diesel engine and the charging system on it puts out only 12 volts at idle after first starting it up than after about 50 seconds or so, the idle kicks up and the alternator starts putting out the normal 14 volts. I was told this is because the glow plugs take up that voltage until they turn off.
That leads me to ask, is this a diesel?
I don't read that it has a decoupling pulley.
It's impossible to remember what every single year, make and model has in it, but I will relist it.
Actually, you have to relist it.