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Truck runs but at night time when I turn on the headlights it dies changed alter

(1990 Dodge D150)
in Owensboro, KY on October 17, 2016
Okay it's a 84 Dodge d150 change the alternator battery is good drives perfectly fine during the day but at night time when I turn on the headlights it's slowly drains down at least the headlights get dimmer and then if I try to turn everything on it'll finally kill itself out if I let it sit for a little bit I can turn the headlights on in their bright again but have to jump it same thing happens a little bit later after driving
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on October 17, 2016
IF you can't find an external voltage regulator mounted on the firewall ... Is the yellow *check engine light* staying on? .. Have you checked for any codes like code (41) maybe? .. 1990 is famous for having different charging system components from one vehicle to the next .. Guess they couldn't make up their minds! .. In ANY event, the alternator is not keeping the battery charged!
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on October 17, 2016
external mounted voltage regulator(silver box)more than likely is this Part Number: VR733,SEE WHAT IT LOOKS LIKE>>$14.99 at the ZONE.
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on October 17, 2016
I'll check that tomorrow when I get up but that makes sense because I think it looked a little weird the other day when I was looking at it but I didn't put two-and-two together
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