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At that temp, you may get a slightly longer after glow :) If that's the case, the OP may just need to tighten is alternator belts. I wouldn't trust the GP card though. So I was walking around in the 70 degree t-shirt weather yesterday down here in North Carolina...

Good call, what is the weather like across the pond this week? I think you start to get that after glow when it gets into the 40's or lower. Your mileage may vary...plus you have that whole metric thing to convert to. Chip Chip :)

Obviously trying to diag across the internet is tough but it sounds like you have old slipping drivebelts and a glow controller than is cycling back on when it shouldn't be. Am I the only one that is reading that here? No one really has addressed why the voltmeter would go from green to red...

From your description, it sounds like your GP system is turning on after the initial cycle on start up. If the GP's come back on, your volt meter will go down due to electrical load. Your GENs may complain too if the truck is at an idle, belts loose, idle speed low, etc. That would be the only...