My battery light came on and the heater stopped working and the gauges stopped as well in my 1995 pathfinder 3.0 v6.i replaced the altenator and the battery and have checked all fuses i can and its still giving me a faint battery light and the heater still deosnt work.the car does run, whats my next step?

Wild guess, but if the heater was jammed or had a short, it could have been the original cause of the last alternator burning out and could still be causing a strain on the current one.
First check if the alternator really is working ok by putting a voltmeter across the battery and seeing 12.5 at idle, and over 14 when reved.
Disconnect the fuses, one at a time, to see if the light goes out completely or voltage rises.
If you do, then trace the draw to its component, like the switch, a rubbed through wire, bound motor, etc.

But I agree with hotchevy1965 that dirty battery terminals or bad engine ground could also do it.

SOUND LIKE ALTERNATOR BELT TOO LOOSE NEED ADJUSTMENT.OR ALTERNATOR DRIVE BELT GLAZED AND SLIPPING.IF ALL IS GOOD BATTERY CABLES WORN CAUSING POOR GROUNDING PUTTING HIGH RESISTANCE ON CHARGING CIRCUIT OR YOU COULD HAVE LOOSE,DIRTY CABLES WITH CORROSION BUILD UP.OR ALTERNATOR WIRES LOOSE OR BROKEN.