91' Chevy s10 bad alternator?

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Matthew D

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I have a 1991 Chevy s10 Pickup, on my way home from work I was going about 60 mph and all of the lights in my truck started to dim, the heater fan slowed down, and the engine started stalling a little. Each time the engine stalled the speedometer would read 80+ mph. I made it about another mile or two before the truck died. I coasted into a driveway and opened the hood. When I tried to start the truck back up it didn't try to turn over, it just made a clicking sound. Another motorist drove in and offered to give me a jump, we did and the truck started fine. It ran smooth for about ten seconds until it started stalling again and died. We tried again and as soon as it started I kept the engine revved up past 2500 RPMs and it ran constant for 30 - 45 seconds until it started stalling and died so we repeated this several times with the same result. Finally we did it one last time and I tried to drive the truck, as soon as I put it in gear and started to let the clutch out, it started to stall, giving it a little more gas to keep the engine from dying I pulled onto the road and the truck was running fine until I got up about 35 MPH (fourth gear). It stalled and died. The only thing I can think of is the alternator or battery is bad. How can I check each of these and how much does it cost to replace an alternator if that is the problem? If you think it might be something else let me know.
 
an exchanged and do it yourself looking at maybe $65 or so. If a mechanic does it maybe about $350. It is quite labor intensive, not to mention should change the belt and clean the cables.
 
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