I have an L200 diamond truck which started showing battery warning light and water in fuel filter warning light at the same time, checked the battery and was being over charged so alternator was replaced but still over charging any idears
The alternator produces current but it is also accompanied by a voltage regulator circuit to prevent overcharging. That is the area that needs addressing to resolve your anomaly.
SOURCE: nissan terrano 1996 td27 charging issue.
Did you hear the one about the Terrano with a charging problem?
Just fix it by replacing the thermostat!
Seriously - check your temperature gauge does it take ages for the needle to barely get off cold? (and is the heater useless?)
The needle should get to just below half way in 2 or 3 minutes.
If the thermostat is stuck open, then the engine does not get up to temperature.
The glow plug control senses the engine temperature is cold, so the glow plugs stay on for an extended period of time (sometimes 10 to 15 minutes) - short trips particularly in winter, with more headlight driving - the alternator can't keep up with the current being drawn off and from time to time you will end up with a flat battery!
A thermostat is cheap, and easy to replace (three bolts and about a half litre of coolant - I pumped the coolant from the top of the radiator, and didn't spill a drop when the thermostat housing was removed).
Sure enough, as the engine temperature reached about 50C, the glow plugs turned off.
SOURCE: battery not charging light comes on. new battery
I don't know what kink of car you have, but some will have a alternator fuse, also with a volt meter check voltage on big wire at back of alternator should have 13.5 + volt's, then check voltage at battery should have same voltage there also, do this with car running, if you do not have same voltage at battery less short between alternator and battery or bad fuse. There also some fuse links at starter on some car's.
SOURCE: 1993 Dodge D350 diesel alternator not charging
Hi, I will keep this short, but just a tip on the tester they use, I had one bench tested and it showed up it was good and the built in regulator was good also. Put it in the auto along with a $75 battery, and the discharge light was still on!!. So, I checked all of the charging circuit wiring finding nothing wrong, and put a rebuilt alternator on. Took care of my problem, the alternator was intermittent, sometimes charging when they checked it at Auto-Zone, but stopped putting out when I put it back on the car. I lived 16 miles from the auto store, so it was a pain going back and forth, plus the cost of gas!! I would change it out if you can at this time. I am sure this is what is going on if all looks good under the hood as far as wiring. Check to see if you have the 75 amp alternator fuse under hood also. It may be gone. Make sure the hot cable to the alternator and wiring plug is OK. Change it out and you will be good!
Sincerely,
Shastalaker7
Please keep me posted on the out come and don't forget to rate me :))
SOURCE: Saab 93 1.9 tid warning
The easiest way to check is with the car running, disconnect the positve side of the battery, if the car dies, then it is the altenator, if the car keeps running then it is the battery. If you have a volt ohm meter, check the chrge going to the battery you should get between 12 and 14 volts if it is lower than 12 you have an altenator issue. the altenator should always produce enough to charge the battery and run the car at the same time, if not then the battery wears down.
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