altenator not charging,

[upstate240sx]

ok i just did an sr20 swap and id drive around a bit and all of the suddent my radio would cut out, and my dash light for the battery would start blinking the higher i revved it could go out, but at idle it would come on, i charged my battery and it holds a charge, i changed alternators to the ka alternator and it does the same thing, i get a voltage that drops from 12 slowly while the engine is running i think my belt might be the problem, the ribs are beat apart (turns out before my alternator bracket wasnt bolted down) how much play should be in the belt.? i dont hear the belt slipping though, but before is slipped like a mofo

[aNskY]

voltage should be in the 14 range while idling if your alternator is good. sounds they are both bad. take them both to autozone, they test alts for free.

[a100pureplayaz]

i replaced a alternator and same problem happened if its still occours make sure when you put the key in the on position the batt. light goes on

[Massimo Power]

Definetly take it in to autozone to have them test it.. its free.. ! :)

[S14DB]

Test the Battery and Alternator.

[swayray]

check the alternator fuse... i think its the 75amp one.... i blew two of those with the same symptoms...

[upstate240sx]

yea i checked that fuse, i got a new belt, my old one had all the ribs completely sheared off, basically what i was doing was using the ka waterpump pulley which has a different offset then the sr20 wp pulley. so that in conjunction with my bracket being loose caused me to chew up belts, ne how i got the new belt and it runs great now, squeals like crazy though, its tensioned im running somewhat of a rigged tensioner setup. if anyone has a oem sr20 w/p pulley ill take it off your hands.