89 Integra battery light

[shortys1519]

The battery light in my car comes on when I hit 4000 rpms and I'm not really sure why its happening just replaced alternator and battery and it was fine then this just started happening

 

[*DA3*]

check your terminals if they screw down right

 

[sightless117]

Do all your lights get dimmer as well?

 

[shortys1519]

No the lights don't dim out when the battery light comes on

 

[sightless117]

Check the fuse and connections for the PGM-FI and the voltage regulator plug on the back of the alternator. the control module varies the draw from the alternator based on total vehicle speed and rpm. So anything related to the understanding of these two variables could cause an error.

 

[shortys1519]

So I checked and the lights do dim when the battery light pops on

 

[sightless117]

Sounds like a loose terminal or a bad voltage regulator. Is the alternator new or "new"?

 

[shortys1519]

Its brand new. Paid $113 for it. Luckily its under warranty if it turns out to be bad. When I put a voltmeter to it it only went to about 13 not 14.5

 

[sightless117]

If There's a doubt, trade it out

 

[Classa64]

I would bet the belts just not quite tight enough, try tightening it a bit more and try it. High RPM belts slipping a bit but might not sqeel. Seen it before .

Also 13v is ok....It will range from 13-15 depends on loads battery condition all that.