Charging Problem 87 5ktq

[JJK1204 at aol.com]

If you can remember a couple of weeks ago I was having problems with our 87 
5ktq. It had stalled a couple of times and was a reluctant idler in the 
morning. Finally it stalled and would not start. I had discharged the battery 
so I gave it a good charging. I could not reproduce the problem and after 
quite a bit of inspection and tightening was sure that all of the intake and 
crankcase hoses were tight and solid. This morning it started to exhibit the 
same pattern as before, not idling well in the morning. I noticed that the 
interior lights dimmed considerably when at idle and only defroster on. I 
checked the voltage at the HVAC head #11 and found that the voltage was 14.1 
with everything off, but quickly dipped to ~12.2 with only the blower and 
headlights on. If I increased the revs there was little or no change. The 
alternator is a lister modified unit less than a year old. I replaced the end 
of the small wire to the alternator when I installed it and the belt is 
properly tensioned. Is it possible/likely that my stalling problem is being 
caused by low voltage? Where should I look for the voltage problem? Any help 
will be greatly appreciated.

John Katos
West Dundee, IL
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