lights dim under full throttle

yellerstang · Oct 7, 2010

My lights dim under hard acceleration, the battery light comes on in the instrument panel.

Belt? Tensioner? Common problem? Battery stays charged, it just comes on during a hard run.

ChillPhatCat · Oct 7, 2010

I'd get the battery checked... could be at the point where it's maintaining borderline voltage and the charging from the alt can't keep it high enough... or maybe the alternator, it could be dying and can't keep up with demand from the ignition at high RPM? I don't think belt slippage could get bad enough to do that without you smelling it burning.

trinity_gt · Oct 7, 2010

In addition to the spark load the fuel pump duty cycle will go up under WOT putting an addition load on the alternator.

OP, if you load the electrical system by:

turn on the highbeam headlights
turn on the rear defogger
turn on the wipers
turn the HVAC fan to max

do you see the charge light come on? Do you have a voltmeter? If so, measure the voltage at the battery terminals at idle in this condition and at ~2000RPM and report back.

Measure both DC and AC voltages if you can.

yellerstang · Oct 8, 2010

lights

Its going back to the dealer, I just bought it two weeks ago, warranty!

Rejekt · Oct 8, 2010

yellerstang said:
Its going back to the dealer, I just bought it two weeks ago, warranty!

Yep, let them figure it out lol

lights dim under full throttle

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lights dim under full throttle

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