Fading lights at idle and my stereo sometimes pops at idle. Iights also fade when the bass hits at idle... I still have the OG battery.

 

Gotta voltmeter? If not just go for the autozone free test.

 

You can also (prior to going to Auto Zone, etc.) perform the following . . .

http://www.mustangworld.com/ourpics/fcar/dtcodes.htm
&
HEC Instrument Cluster Diagnostics
http://www.mustangworld.com/ourpics/News/99hec.htm

 

Good point lol. Yes I have one.

 

If its dropping below 12v with lights and everything on, I would lean towards alt. that free test at the zone is always easier though.

 

I have the same problem. I tested everything. It's just the subs in the trunk hitting. Makes my lights fade. So we got a better battery because before it would die. But all good now

 

Did the odometer test. All is good. Battery is good with my multimeter

 

What is it charging at idle?

 

If not just go for the autozone free test.

 

You do know this is why people run power caps and (or) 2 batteries, right?

 

Nice first post. Welcome!

 

That's why my prelude is capped and double batteried lmao

 

Caps? Never heard of that

 

Capasitors.

 

Is the alt charge on that gauge test? If so it was 15.5v-ish. I've been thinking of a new battery but it reads just over 12v so it's still good. It starts first time everytime. If I press the brake and both window buttons I can almost stall the car. Drops to about 200rpm.

 

Dang... no bueno...

 

Sooooooooo battery? alternator? 2013 boss 302? Haha I wish!!!

Blinker fluid?
Canooter valve?

 

What voltage is your car charging at idle?

 

How do I test that?

 

Voltmeter on battery while car is idling.