alternator problem

[coco1476]

Hi everyone!
I think i might have an alternator problem. When i'm driving at night, as soon as i push on the brakes or use the heater or the engine fan comes on or uses any kind of electrical power, i see my headlights and my dashlights starting to flash, they do not flash like a flasher but they go dimmer and bright again, and the engine starts to stumble, everytime the lights go dimme the engine looses power. I did test the alternator with a tester with the engine running as soon as i use electrical power of the car the meter range from 12 volts to 14 volts just like a clock 12 volts-14 volts-12 volts-14 volts. Does anyone know what could be the problem?
Thanks

[CREWZIN]

Not sure of the exact problem but if you take it to one of major chain auto stores like Auto Zone, they will check out the battery and charging system for free.

[GALVANIZEDYANKEE]

Check your alternator voltage while it is under a load. If you don't have a testing load, turn on as many devices as you can. Also check the ground connections. Poor ground connections are common on the Cruiser.

[ucantcme]

My headlights will dim down when I use my window switches....Not too much, but enough for me to notice!

Not a big deal for me.

[GALVANIZEDYANKEE]

It is difficult to troubleshoot electrical problems without electrical/electronics knowledge. Unlike mechanical failure you can't always see the defective part.
If you have a voltmeter you could check voltage drop across the cables.
If you check voltage between the cable source point to the cable termination point, you can check for a bad cable or connection. This measurement should be extremely small, like less than .5 Volts. Make this measurement when cranking the engine to check the battery cables. Your problem seems to be a bad cable or connection. The battery is dependent on the alternator to stay charged. With a bum alternator the battery will usually run down to a point where it wont crank the engine at start.

[coco1476]

i did recheck every cable and sanded every connection and they where rusted, now it looks ok but i'll try it tonight when it's dark i'll see better if it's all good. Thanks everyone