Any downside to running a 3G alt?

CrazyInBlack · 11-24-2007, 04:50 PM

Thinking I should upgrade b/c I think mine is bad

EHardy1971 · 11-24-2007, 04:54 PM

none that I know of,except I think I need a bigger battery now,my factory replacement is overcharging right now,but it may be because it's 6 years old! It's actually one of the best mods I've done to mine!

QWKSNKE · 11-24-2007, 04:56 PM

no downside to it

Italian LX · 11-24-2007, 07:27 PM

In a Fox-body, it requires a small amount of grinding on the bracket (very minmal and easy to do). You also need to run a large gauge cable from the alternator to the battery to handle the extra current.

Other than that, it's an easy upgrade and very well worth it!

SkurdalenFox · 11-24-2007, 11:33 PM

Directions- http://www.fordfuelinjection.com/?p=75

Make or purchase a new charge cable. The existing one (actually 2 or 3) is/are small. They are also probably fairly ragged.

Buy a 3G kit. It'll come with all the hardware required. More expensive vs. fewer hassles.

This shows the stock setup. I'll try to post the other wiring diagram soon. Must write memo, you understand

How The Circuit Works

The Alternator is belt-driven by the engine. Field current is supplied from the Integral Alternator Regulator (IAR), mounted on the rear of the Alternator, to the rotating field of the Alternator, through two brushes and two slip rings.

The Alternator produces power in the form of alternating current. The alternating current is rectified to direct current by six diodes. The Alternator Regulator automatically adjusts the Alternator field current to maintain the Alternator output voltage within prescribed limits to correctly charge the Battery. The Alternator is self-current limiting.

The regulator voltage control circuit is turned on when the Ignition Switch is in START or RUN and voltage is applied to Regulator terminal I through a resistor in parallel with the Charge Indicator. When the Ignition Switch is OFF, the control circuit is turned OFF and no field current flows to the Alternator.

The Charge Indicator is connected across the terminals of a 500-ohm resistor in the Instrument Cluster. Current passes through the Indicator when the Ignition Switch is in START or RUN and there is no voltage at terminal S. When voltage at terminal S rises to a preset value, the regulator switching circuits stop the flow of current into terminal I and the indicator turns OFF.

System voltage is "sensed" at Regulator terminal A. The regulator switching circuits turn the warning indicator ON to indicate a system fault if terminal A voltage is excessively high or low or if the voltage at terminal S is below a preset value.

A Fuse Link is included in the charging system wiring on all models. The Fuse Link prevents damage to the wiring harness and Alternator if the wiring harness should become grounded or if a booster battery is improperly connected to the charging system.

coupe · 11-25-2007, 12:19 AM

No harm. It's a nice thing to have, especially if you're running more accessories and/or a stereo system. The battery won't know the difference.

11-24-2007, 04:50 PM	#1
CrazyInBlack Crusin... Join Date: Feb 2005 Location: Various Places in Middle AL Posts: 3,542	Any downside to running a 3G alt? Thinking I should upgrade b/c I think mine is bad __________________ Liberal education has nothing to do with liberal or conservative politics. Liberal education is the simple idea of a broad and well-rounded course of study in the humanities, social sciences, sciences, and the arts. The overarching goal is to liberate the mind from ignorance and superstition.

11-24-2007, 04:54 PM	#2
EHardy1971 Trunk Monkey Join Date: Jun 2007 Location: Home Posts: 5,708	none that I know of,except I think I need a bigger battery now,my factory replacement is overcharging right now,but it may be because it's 6 years old! It's actually one of the best mods I've done to mine! __________________ Eric 89 LX Coupe-Juiced 01 Lightning-Boost 06 TBSS

11-24-2007, 04:56 PM	#3
QWKSNKE 3v's are slow Join Date: Dec 2004 Location: Here and There Posts: 17,152	no downside to it __________________ 2009 Porsche Carrera S 2008 ///AMG C63.. Eurocharge Tune. RIP 2019 AMG GLC43..wife's 03 F250 SD.. Edge Evo, AFE Stage 1 CAI 08 GT. JBA axle back, FRPP springs, FRPP swaybars.. daughter's 01 Cobra vert... wife's I need a new toy

11-24-2007, 07:27 PM	#4
Italian LX Daddy x4 ...we're done Join Date: Dec 2004 Location: Oxford, AL Posts: 11,551	In a Fox-body, it requires a small amount of grinding on the bracket (very minmal and easy to do). You also need to run a large gauge cable from the alternator to the battery to handle the extra current. Other than that, it's an easy upgrade and very well worth it! __________________ -Brian '86 Mustang GT Convertible '88 Mustang LX coupe '11 Odyssey TE '21 Insight Touring

11-24-2007, 11:33 PM	#5
SkurdalenFox Senior Member Join Date: Sep 2005 Location: Boulder, CO Posts: 463	Directions- http://www.fordfuelinjection.com/?p=75 Make or purchase a new charge cable. The existing one (actually 2 or 3) is/are small. They are also probably fairly ragged. Buy a 3G kit. It'll come with all the hardware required. More expensive vs. fewer hassles. This shows the stock setup. I'll try to post the other wiring diagram soon. Must write memo, you understand How The Circuit Works The Alternator is belt-driven by the engine. Field current is supplied from the Integral Alternator Regulator (IAR), mounted on the rear of the Alternator, to the rotating field of the Alternator, through two brushes and two slip rings. The Alternator produces power in the form of alternating current. The alternating current is rectified to direct current by six diodes. The Alternator Regulator automatically adjusts the Alternator field current to maintain the Alternator output voltage within prescribed limits to correctly charge the Battery. The Alternator is self-current limiting. The regulator voltage control circuit is turned on when the Ignition Switch is in START or RUN and voltage is applied to Regulator terminal I through a resistor in parallel with the Charge Indicator. When the Ignition Switch is OFF, the control circuit is turned OFF and no field current flows to the Alternator. The Charge Indicator is connected across the terminals of a 500-ohm resistor in the Instrument Cluster. Current passes through the Indicator when the Ignition Switch is in START or RUN and there is no voltage at terminal S. When voltage at terminal S rises to a preset value, the regulator switching circuits stop the flow of current into terminal I and the indicator turns OFF. System voltage is "sensed" at Regulator terminal A. The regulator switching circuits turn the warning indicator ON to indicate a system fault if terminal A voltage is excessively high or low or if the voltage at terminal S is below a preset value. A Fuse Link is included in the charging system wiring on all models. The Fuse Link prevents damage to the wiring harness and Alternator if the wiring harness should become grounded or if a booster battery is improperly connected to the charging system. __________________ Jim Last edited by SkurdalenFox; 11-25-2007 at 12:06 AM. Reason: Added diagrams, so you know what you're looking at.

11-25-2007, 12:19 AM	#6
coupe Super Moderator Join Date: Dec 2004 Posts: 6,313	No harm. It's a nice thing to have, especially if you're running more accessories and/or a stereo system. The battery won't know the difference. __________________ " If you can't explain it simply, you don't understand it well enough. " - Albert Einstein