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Old 04-12-2016, 08:16 PM   #1
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Alternator

Hi. I have 2000 nat tradewinds with a cat diesel.
My question. Is when i start it the battery lights stays on for around 2 to 3 min then goes off and seems alternator takes over.
Is this normal??
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Old 04-12-2016, 09:49 PM   #2
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Quote:
Originally Posted by acehatz View Post
Hi. I have 2000 nat tradewinds with a cat diesel.
My question. Is when i start it the battery lights stays on for around 2 to 3 min then goes off and seems alternator takes over.
Is this normal??
Well Sir,
The very first thing I'd do if I were you is, try not to pay too much attension to "idiot" lights. What I'd do is, take a reading of your starting batteries, right at the posts, with a volt-ohm meter, when the engine IS NOT RUNNING. Note the findings.

Then, with the meters probes still on the battery, have the wife or, anyone you choose, start the engine. Watch the meter immediately after startup to see when any voltage change, takes place and, just what kind of change it is. Then you have a time reference to compare to, RIGHT AT THE BATTERY(S).
Scott
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Old 04-13-2016, 04:44 AM   #3
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No, not normal. The alternator should begin producing current right away. Either it is not, or the batteries are so bad it takes that long for the voltage level to come up enough to turn the light off.
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Old 04-13-2016, 05:06 AM   #4
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Have you checked the belt that drives it.

A loose belt will slip for a while after startup due to the extra load on the alternator, needed to recharge the batteries.

As the belt slips, it gets hot and starts to grab better.
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Old 04-13-2016, 05:19 AM   #5
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Have you checked the belt that drives it.

A loose belt will slip for a while after startup due to the extra load on the alternator, needed to recharge the batteries.

As the belt slips, it gets hot and starts to grab better.
Vee belts might slip. Serpentine belt with good auto tensor may break, but won't slip. just sayn
As another poster said read alternator out put at alternator during engine start. Then read charging voltage at batteries. That will tell whats happenin.
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Old 04-13-2016, 06:37 AM   #6
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A worn out serpentine belt can slip and will also keep the alternator from not immediately start spinning fast enough to initiate a charging state. A bad tensioner will also do the same. The belt might not squeal. Test with a meter at batteries is the first place to test.
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