After 20 minutes of driving my battery light comes on.
The battery does not loose strength according to the dashboard gauge. The headlights do not dim and after turned off it will start strongly so there is no lost power. If the van is off for several minutes I can start it and the light will remain off for about 20 minutes and then come back on.
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Re: After 20 minutes of driving my battery light comes...
Have your alternator tested. you could have a bad diode in it allowing current to backfeed this would cause light but it would still charge some. also check connections on alternator primarily the big plug have had some problems with those getting hot and burning
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Alternator. Have it tested with a voltmeter while on the car and running. Or take it off and have it tested. The current to run the car and the accessories is from the alternator when the engine is running. The battery light coming on alerts you that the alternator is not doing its job.
i had this happen with my dodge ram 1500. the guy i bought it from put 350 dollar moon lit lights in with leds and they looked impressive but the issue was that they didnt go bright and i could only see 40 feet in front of me and i was sure taping led flashlights would have done me more good that those stupid headlights. then i had the idea of if the brights work and the dims dont then that means no electricity is getting to the dims so i decided to bridge the power from the bright headlight to the dims and it made all four work. now they all work, and only on bright. so im figuring there is a issue with the wiring in the truck. so this is a temporary solution if you really need just plain old lights like i did because i live out in the country
Check your battery connections and do a voltage test to battery with engine running lights off, then check with lights on. You need a minimum of 12.5 volts but should have 13-14 volts even with lights.
what probley happened the alternator started to heat up alittle to much and caused the belt to spin on the pulley i would go ahead and get the alternator replaaced as soon as possible. as for the lights dimming and the gauges not working you was running off your battery making the vehicle mess up i would also get your battery checked while your at it.