When the car gets to a decent temp, my idle is all jumpy and my battery gauge is jumping around, and at night when my lights are on and this all happens my lights look like a strobe light.
this all started happening when i put in a fan control module for my secondary fan. so i took it out but the problem still occurs.
Did i mess up a relay some where and is it shorting out? because i tied the new module into my secondary fan relay on the passanger fender next to the battery. I tapped in to the power of that relay.
And i was using the Hayden adjustable fan turn-on relay.

 

lights looking like storbes tells me you need a new alternator. Sounds like the regulator inside the alternator is bad, causing your battery voltage to bounce all over the place. I dont think your second fan had anything to do with it.

Get a new alternator, swap it out with the old one. You can always take the alternator back the next day if it doesn't fix it.

 

thanks, tomarrow i have time off of work so i can go down to allied and pick one up.