yo, Motorcraft!
Considering an Upgrade in output to a 3G?
If so;
3G Installation, Torque Specs, Parts Break-Out Diagram, etc. Source: by Ryan M (Fireguy50) at fordfuelinjection.com
130 amp (3G) Bracket Mod in a 90 Source: by Bob K (RLKBOB) at SuperMotors.net
130 amp (3G) Installation in a 91 Source: by DcSkater602
Excerpts (see bracket notching in Bob's write-up, above)
"wiring kit w/ 175amp fuses and 3g harness
3g alt 160amp... 2 1/16 pulley both from fireguy...he installed the pulley for me too
had to do the usual notching of the bracket
heres where i mounted my fuses
get an idea how corroded the cables get... this is 6 inches from the end.. this is the relay to starter wire... the main ground cable from battery to frame to motor was corroded almost the entire length inside the coating
i used these two kits and a battery + charge cable"
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3G Interchange Facts Source: by Clarko (B-Ronk, Brian C)
Had to start this thread since there is much misinformation and confusion about the 3G alternator upgrade. This is not an install thread, just a guide on where to get the alt you need, a wiring diagram, and pulley sizing. All photos and some of the text is courtesy of Ryan at FordFuelInjection.com.
Why go 3G?
Because your factory alternator is barely adequate for your vehicle, stock.
Added off-road lights or a big stereo?
You need a bigger alternator!
Some 90,
any 91-92, and some 93-99 non DOHC Ford Taurus will be able to donate it's alternator to your vehicle.
If you have an 86-93 Mustang or
87-92 Truck with a 302 or 351W: you have a 2G alternator. This is an early serpentine style. This can only be replaced with a Pivot Mount w/ 7.00” ear spacing alternator. Minor bracket clearancing may be required. This can be found in the following cars:
93-99 narrow-eared non-DOHC Taurus
94-95 V8 Mustang
94-00 V6 Mustang
94-97 V6 T-Bird/Cougar
95-98 Windstar
91-94 V6 Lincoln Continental.
The early serpentine car and truck alts on the RJM Injection Tech site are interchangable but the plug and charge stud are clocked differently to fit the wiring to the bracket better. The Pivot Mount w/ 7.00” ear spacing can be swapped into:
1987-1992 Broncos/E-Series/F-series
Pre-1995 Mustangs
Other vehicles that use a 7.00” wide Pivot mount alternator
Clearancing the stock Truck Serpentine bracket to fit a 3G
:
Charge Cables: When you swap from a 1G or a low output 3G to a 130 or more amp 3G, although you do not NEED a larger charge cable such as a 2 Gauge, it is a great idea. Smaller wires/cables cannot always handle such a load and they tend to heat up, some to the point of melting the wire and could start a fire. ALWAYS make sure you use a megafuse rated at above your alternator amperage.
Pulleys: For pulleys, you can either re-use your old one, which sometimes you may need a very small washer to use as a spacer if it rubs in the 3G case at all, or you can get a different sized one. It all depends on your needs. A smaller pulley will spin the alternator faster at idle to create maximum output. A larger pulley will allow the engine to rev higher without driving the alternator to fast. Large 3G alternators are safe to ~15,000RPM max. Again, Alt RPM = Engine RPM x Crank Pulley Diameter ÷ Alt Pulley Diameter.
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Ford Motorcraft® (fordinstallersupport.com) - Rotating Electrical (Starters, Alternators, Window & Wiper Motors, etc.), Ignition Components, Wire & Cable, Battery Cables, Windshield Washer Pumps, Wiring Harness Accessories, etc. Parts Catalog, Bronco/Ford truck & all Fords w/Ford Part Numbers, Illustrations & Cross References (54 MB pdf)
< <'> . "The Beast" and I appreciate your input!
