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Old 12-21-2003, 11:44 PM   #1
Woody643
Scooby Newbie
 
Member#: 34739
Join Date: Apr 2003
Location: Gainesville FL
Vehicle:
03 WRX
Silver Metallic

Default Voltage Regulator / Lights dimming issue

Hey,

I am having a dimming lights issue with my my03 wrx. All of the lights (headlights, dash, dome map, and even the headunit) dim whenever there is a bass note played through my conservative system. Dimming starts when the volume is only about 1/3 up, and gets progressively worse from there. This is with the engine on at idle. Here is what I have:

Ground mod 8 ga. wiring

Alpine headunit
MTX Thunder 6304 amp, 37.5 x 2 (front components)
325 x 1 (sub, Meniscus sw1084 sealed box)
Power and ground 8 ga. wiring Ground is connected to the rear seat belt anchor.

That's it! As you can see, it's nothing special. I've heard that a cap doesn't do much, and an alternator is expensive. The system sounds fine, but I think that at higher volumes, the voltage drop prevents the amp from delivering all of the bass it is capable of.

I've also heard that the speed of the voltage regulator determines how fast the alternator ramps up voltage to cover the quick depletion after the bass note occurs. Are the regulators internal or external from the alternator? Has anyone ever replaced theirs with an aftermarke one? I'd hate to spend the money on a high output alternator if all I really needed was a faster regulator. Any ideas???

Frank
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Old 12-22-2003, 12:29 AM   #2
ruiner
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Member#: 20784
Join Date: Jul 2002
Chapter/Region: TXIC
Location: Dallas, TX
Vehicle:
2002 Impreza WRX
WR Blue

Default

Voltage regulators are inside the alternator. I can get you a high output unit that should take care of most if not all of the dimming at idle. Let me know through PM if you're at all interested.

Chad
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Old 12-22-2003, 08:06 AM   #3
grknss
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Member#: 44592
Join Date: Oct 2003
Chapter/Region: South East
Location: Red Banks, MS
Vehicle:
2004 WRX STI
Platinum Silver Metallic

Default

A high output alternator will definitely fix that, although it is pretty $$$$ look into Batcap's I am using a setup they suggested and I have had no real dimming issues and I am running a bit of a higher power draw in my system.
my vehicle voltage (running at idle) will dip into the 11.9 range with the system up and a lot of bass. while driving 13.5 is about where she stays steady and crusing 14.1/14.5


if you'd like I can post what my system is to compare
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Old 12-22-2003, 11:02 AM   #4
ruiner
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2002 Impreza WRX
WR Blue

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With the high output alternator I sell, I am always over 14 volts even with the system at full crank at idle. Light still dim slightly but i do not lose any voltage what so ever.

Chad
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Old 12-22-2003, 01:34 PM   #5
grknss
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Chapter/Region: South East
Location: Red Banks, MS
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2004 WRX STI
Platinum Silver Metallic

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cool, how much is it and will it fit an STi what is the output compared to stock?

I maybe interested in it

thanks
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Old 12-22-2003, 04:38 PM   #6
ruiner
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2002 Impreza WRX
WR Blue

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Send me a PM on pricing, output of STi stock is 90A, my unit is 150A. Stock WRX is 75A. Fitment is fine for both STi and WRX. Also fits GC Impreza.

Chad
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Old 12-22-2003, 04:46 PM   #7
offset
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Join Date: Feb 2003
Chapter/Region: MWSOC
Location: Dayton, OH
Vehicle:
2004 Impreza STi
Silver/Silver

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I am not trying to steer anyone away from Chad as what he is offering can be of siginificant help; but you may consider upgrading your "magic 3" wires first (upgrading as in using a larger gauge and better quality wire). There have been numerous discussions on the benfits of this around the web and has completely fixed the 'lights dimming' problem of some folks. And besides, it is a very cheap upgrade that really should be done no matter what other electrical upgrades you perform. Here is the brief explanation of which wires are the ones to replace...

1)Neg batt to chassis
2)Neg batt to engine block
3)Alternator body to chassis

offset
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Old 12-22-2003, 08:30 PM   #8
grknss
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Member#: 44592
Join Date: Oct 2003
Chapter/Region: South East
Location: Red Banks, MS
Vehicle:
2004 WRX STI
Platinum Silver Metallic

Default

I agree that the gauge of wire used is important, I am already running sufficient gauge wire for my application
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Old 12-22-2003, 11:30 PM   #9
Woody643
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03 WRX
Silver Metallic

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Offset,


I've heard of the "big three", and have done the ground mod, to include

Negative batt to body, Negative batt to block, and block to frame/body.

Someone on another board mentioned to add another wire from your alternator output to positive battery. Stock, there already is one, they were just saying to add another for less resistance.

Has anyone done this yet?

Frank
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Old 12-22-2003, 11:39 PM   #10
ruiner
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Chapter/Region: TXIC
Location: Dallas, TX
Vehicle:
2002 Impreza WRX
WR Blue

Default

Magic 3 wires are definitely important, I don't take it as you steering anyone away from me I actually want to do that to my car, but have been too lazy to do so.

Chad
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