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Old February 5th, 2007, 10:13 AM   #1
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Default Its cold out, whats with my alternator/battery? 5.7 ram.

Since it has been subzero the last week, I have noticed my battery charge gauge has been reading at the peak of the "acceptable" range according to the gauge. This is almost 2 volts higher then the middle of the range. Is there temperature compensation going on to insure a start, or is my alternator starting to fail?
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Old February 5th, 2007, 11:26 AM   #2
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Originally Posted by clarkstoncracker View Post
Since it has been subzero the last week, I have noticed my battery charge gauge has been reading at the peak of the "acceptable" range according to the gauge. This is almost 2 volts higher then the middle of the range. Is there temperature compensation going on to insure a start, or is my alternator starting to fail?
Its normal. My readings on the DRs in cold weather are usually around 14.8-14.9 volts. Well, that was with the cummins mostly, did a lot of cld weather temp testing looking for max voltage conditions.

Whats it reading when you've been driving of ran hour or so?
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Old February 5th, 2007, 12:32 PM   #3
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Its normal. My readings on the DRs in cold weather are usually around 14.8-14.9 volts. Well, that was with the cummins mostly, did a lot of cld weather temp testing looking for max voltage conditions.

Whats it reading when you've been driving of ran hour or so?
it drops down to the middle of the normal range. I just noticed each day for the last week that it has been alittle higher. Then today when I went to work, it was at the top of the "normal" range. but it was also -8 when I left my house.
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Old February 5th, 2007, 12:58 PM   #4
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Sounds normal.

All the electronics on your truck are designed to be fully functional from 9 to 16 volts, so should be fine.
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Old February 5th, 2007, 12:59 PM   #5
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You need to brake torque for 5 minutes prior to starting your morning commute.
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Old February 5th, 2007, 01:31 PM   #6
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You need to brake torque for 5 minutes prior to starting your morning commute.
I just assumed he was, as its SOP with that truck for warm ups. Otherwise you will have problems shifting. It puts a much higher load on the shift solenoids and subsequently, a higher current draw. Thats probably what spiking your alternator.

My bad.

Yeah, make sure you are doing your proper brake torque to warm everything up on cold mornings.
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