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Old 11-17-2012, 08:09 PM   #1
Scooby Newbie
Member#: 102896
Join Date: Dec 2005
2004 WRX (Sold)
10 S4, 01 (V4 STI swap)

Default Alternator, Brake + Battery Light?, High Output? Help?

So recently I have been getting a brake light and battery light. My assumptions is my alternators is dying, even though Autozone said it checked out. I have recently added the Big 3, and tried a diode alternator mod. Seems better, but still dips in voltage, thus the lights. Also assuming, my sound system, hids, and other minor accessories are drawing too much.

So I am down to getting a new alternator with a higher output. I have found a 2011 WRX alternator, and I am not sure if it is 110 amps or not. Or if it will fit my 04 wrx. Anyone know? I have been searching on the forums all day.

Anyone try Maniac 140 amp alternators?

subwrx23 is offline   Reply With Quote
Old 11-18-2012, 10:40 PM   #2
Scooby Specialist
Member#: 146819
Join Date: Apr 2007
Chapter/Region: NESIC
Location: Boston / Ipswich, MA
'02 WRB VF-39'd WRX
W/06 STi Drivetrain swap


make sure the big fat wire going from the alternator to the battery has all its shielding intact, and that the connections aren't corroded. This can cause excessive alternator load, and still poor battery charging.

Do a voltage drop test from the battery positive terminal to the alternator post, and from alternator case to battery negative terminal.

HID's draw less amperage than halogens once running, and how powerful is your amp?
ProdriveDreams is offline   Reply With Quote
Old 12-05-2012, 07:35 PM   #3
Scooby Newbie
Member#: 301685
Join Date: Nov 2011
Location: Edmonds, WA
05 Wrx sedan


Maniac motors make good alternators and build to what you want
SRT6 is offline   Reply With Quote

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