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Old 11-28-2010, 05:37 PM
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Battery light and starting problem

So guys my truck has a new problem. Within the past 2 or so weeks I've had to jump start my truck 3 different times. The first time I thought I just maybe left a light or something on. But on the 3rd time I knew something wasn't right. So I took my truck and had the batteries tested and the alternator tested and everything came back okay. Every time it happens I notice while waiting for the glow plug light to go off my battery gauge will start dropping. Also every now and again my battery light on my dash will flicker but never more then a few seconds. So does anyone have any ideas or anything else I can check? I just don't wanna get stranded.
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Old 11-28-2010, 05:47 PM
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My guess is the alternator is on it's way out causing the intermittent batt light and occasionally allowing the batteries to go dead.

Ignore the volt meter on the dash and use a multimeter. Start checking the voltage with the truck running, after you shut it off and before you start it in the morning.

The voltage will be low for up to two minutes when you start the truck. It should return to 14v +-.5 after the glow plugs shut off.
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Old 11-28-2010, 06:02 PM
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Just curious...How old are your batteries?? I know you said you had them tested, however I just went through something similar, had my oil changed at a dealership, part of their service was to test my batteries. They tested great, however I needed to replace them less than 4 weeks later because my truck wouldnt hold a charge in cold weather. Now my truck seems to have come alive with a new set of batteries. The guy at les schwab here in southern oregon, said that on average batteries should last 3-4 years, mine were factory originals at 5 years old. I know $200 in batteries is nothing someone wants to waste, just a thought.
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Old 11-28-2010, 07:03 PM
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I also think the alternator is on its way. I already replaced it once but that was probably around 2 years ago.

The batteries are no more then 3 years old. I know I replaced them since I had the truck and I bought it just a hair over 3 years ago.

I'm going to see how it acts in the morning. But I think I might see if they will give me a new alternator since its under a lifetime warranty.
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Old 12-02-2010, 06:40 PM
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ended up being the alternator and both batteries. starts up like a champ now.
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