3g Alternator ???
Fleet Owner
Joined: Oct 2005
Posts: 20,786
Likes: 1,751
From: Kentucky
The 3G alternator started appearing in trucks around 1993 IIRC.
Parts can be ordered from RJM Technology here: RJM Injection Tech — Alternator Accessories
Parts can be ordered from RJM Technology here: RJM Injection Tech — Alternator Accessories
Fleet Mechanic
Joined: Nov 2011
Posts: 1,823
Likes: 43
From: New York
That's a good "ballpark" date but it definitely varies by application. You would think it might be the same for a given engine, but that's not even true. I submit as evidence the '92 E-series 4.9 van which first got the 3G starting in '92 but the F-series 4.9 truck didn't get it until '95 I believe.
Posting Guru
Joined: Feb 2013
Posts: 1,555
Likes: 1
That's a good "ballpark" date but it definitely varies by application. You would think it might be the same for a given engine, but that's not even true. I submit as evidence the '92 E-series 4.9 van which first got the 3G starting in '92 but the F-series 4.9 truck didn't get it until '95 I believe.
pedant
Joined: Jan 2008
Posts: 23,576
Likes: 38
From: EXTREME southwest CT
Notice above that the first two alternators pictured have four holes between the pairs of ribs on the front. They are also smaller in diameter. (135mm vs 148mm)
Four holes= 95A
Two holes= 130A (not likely to be found on trucks, because no electric fan)
If your alternator has a fan on the front it is a 2nd Generation.
If it looks like the ones above it is a 3G.
Four holes= 95A
Two holes= 130A (not likely to be found on trucks, because no electric fan)
If your alternator has a fan on the front it is a 2nd Generation.
If it looks like the ones above it is a 3G.
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