Hi guys my battery and brake light are coming on intermittently and I cant figure out why. There is no rhyme or reason to it sometimes its when I signal and sometimes it just comes on. They both come on together and I have found no reason why is this a sign of something going bad? I have never heard of this before both of them coming on together.

I have checked the sensors and voltages and all are good no apparent bad wires or open circuits also nothing I can find in my manual

 

These are symptoms of a bad altenator. Check voltage output if you have an ohm/voltmeter or have it checked.

 

x2, bad alternator. my 85 did that and i had to get a new alt.

 

in a '91 22re 4WD

 

mine did same thing I found a shorted wire in the fuse box you also might look into the hvac system i think the blower relay is tied in with that system
good luck

 

mine did same thing I found a shorted wire in the fuse box you also might look into the hvac system i think the blower relay is tied in with that system
good luck

 

I was thinking alternator but it is putting out good voltage around 15v. I think I have something shorting to ground somewhere. It is very weird because I dont notice the typical signs like dimming lights and I have the sylvania silverstars so I would be able to tell. im going to go through and just start ohm'ing(is that a word?) and testing everything. The $20 for a multimeter is well worth it. Thanks for the help. keep it coming

 

have you tried adding brake fluid for the brake light? The master cylinder could be low, but as for the battery the alternator or a short would be my guess.

 

Check the brushes in the alternator, they could be wearing out:
http://www.4x4wire.com/toyota/mainte...nator_brushes/

 

X2 on checking brushes. I have them, $21 shipped to you

 

brake fluid level is fine it turned out the ground wire was loose one the alternator kinda weird. So anyway I go to tighten the nut down on it and it broke off. Apparently it arced pretty bad and basically welded the nut to the ground post. fortunately there was enough left over to use but it is fine now. heres a pic of the nut.