in park......step on the brake......headlights dim

themadness · Post by **themadness** » Wed Jan 11, 2012 9:59 pm

i've noticed that lately when i step on the brake to shift out of park my headlights and dashlights dim for a second. they also do it when i roll up the windows while parked. any ideas?

berettaboi · Post by **berettaboi** » Wed Jan 11, 2012 11:18 pm

that's pretty average/normal. if it's extremely noticeable, you may want to get your alternator tested, and the battery as well.

the 'big 3' i think it is, extra, and larger grounding wires in the engine bay, can help with that i have heard.

DTMAce · Post by **DTMAce** » Thu Jan 12, 2012 12:32 am

Yep, quite normal. My Z does it more than the base, but they both do it.

SummitBalt08 · Post by **SummitBalt08** » Thu Jan 12, 2012 12:49 am

That's because when you hit the brake the brake booster is drawing power along with the taillights

beretta · Post by **beretta** » Thu Jan 12, 2012 1:17 am

my 96 does that, with the windows... and actually once in a while while driving down the road it surges once in a while i see the amp meter drop when it does it and goes right back up like someone kicked in a drew a ton of power and shuts back off. i have a newer alternator and a red top optimum battery. and 6 gauge wire running from the alternator directly to the battery.

Does the same thing with my stereo amp, i killed 3 alternators in my 88 like that lol. but even nothing turned on my 96 does it time to time random...

pghturbo88 · Post by **pghturbo88** » Fri Jan 13, 2012 3:40 pm

Ditto on my 89GT. Headlights on, normal driving, take foot off gas, rolling up to stop sign or stop light, press brake, everything dims briefly from the initial current inrush.

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