Hot Rod - - Wrenchin’@random -

1G: 1964–1986

Ford’s orig­i­nal, sep­a­rately reg­u­lated, al­ter­na­tor de­sign, pro­duc­tion ver­sions were of­fi­cially rated at 38 to 60 amps, al­though higher-out­put af­ter­mar­ket ver­sions are avail­able.

2G: 1982–1993

Ford’s first in­te­grally reg­u­lated al­ter­na­tor, orig­i­nally pro­duced in 65- and 75-amp mod­els. Cor­ro­sion and re­sis­tance buildup in the power-wire con­nec­tor caused high fail­ure rates.

3G: 1994–2008

This in­te­grally rated unit makes for the eas­i­est retro­fit into ear­lier ve­hi­cles. It cor­rects all of the 2G’s faults and uses in­ter­nal fans for im­proved cool­ing.

Use those 3G vari­ants that still have 180-de­gree-op­posed mount­ing ears to re­place ear­lier 1G and 2G al­ter­na­tors.

The 3G al­ter­na­tors are avail­able stock in 95-, 130-, and 200-amp rat­ings.

4G: 1996–2007

The fourth-gen­er­a­tion de­sign in­cludes sev­eral dif­fer­ent case con­fig­u­ra­tions, in­clud­ing the “pan­cake” ver­sion used with 1996–2002 Ford Mus­tangs equipped with Mo­du­lar V8 en­gines. Very com­pact, it came stock with 150- and 200-amp rat­ings. No ver­sions have 180-de­gree op­posed mount­ing ears, so cus­tom brack­ets would be re­quired to use it on ear­lier en­gines and ve­hi­cles.

6G: 1999–present

First used on some 1999 Mus­tangs and Crown Vic­to­rias, it can be found on the 2002–2004 four-valve Mo­du­lar mo­tors, 2005-and later SN197 Mus­tangs, and many other late Ford cars and trucks.

It’s avail­able in 130-, 170-, and 200-amp rat­ings, but unique mount­ing ears make it hard to retro­fit.

[ This is a com­pact “pan­cake” 4G al­ter­na­tor used with mid- to late-1990s DOHC 4.6 Mo­du­lar V8 en­gines in Mus­tangs and Lin­colns. Very com­pact and pow­er­ful, but like all post-3G Ford al­ter­na­tor mod­els, it’s hard to retro­fit be­cause the shape and mount­ing con­fig­u­ra­tion is unique to the chas­sis and en­gine they were in­stalled on.

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