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The simple way to find a drain on the battery is to hook up a voltmeter or test light between the battery positive post and the positive cable. If it is draining on any circuit, the meter will show a voltage drop (either digitally decreasing numer, or the analog needle will move, maybe even "beat" or pulse. If using a test light, it will be lit.)
With the meter or test light in place, begin one by one removing the fuses. When you reach the circuit on which the appliance is draining, the mtere or light will cease to rear voltage.
Now just detect cwhich item on that circuit is the culprit.
Typically it is a lamp, such as the glove box or a dome light. In my case, it was a faulty clock.
Start with that kind of circuit.
As for the slow cranking, clean the cables at the starter and the engine ground which lead off the batttery. Corosion after three years may e preventing a charged battery from getting its juice to the starter, or resisting electrical pressure.
I have the same thing going on right now on my '84 Olds Custom Cruiser Wagon. I think a valve cover oil leak above the starter has affected the electrical connection.
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