Alternator upgrade
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Senior User
Joined: Jan 2004
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From: nebraska
Alternator upgrade
having troubles with my motorcraft on my 7.3 idi. I am thinking of upgrading to a higher output and or different brand possibly a delco 12si. Has anyone upgraded interested in your thoughts or upgrades.
The Southernmost Mod
Joined: Dec 2004
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From: Caracas, Venezuela
The usual upgrade for these trucks is the 3G alternator, RJM has a great (yet a bit expensive) product. But first you need to find out which model you have under the hood currently.
The Southernmost Mod
Joined: Dec 2004
Posts: 6,902
Likes: 21
From: Caracas, Venezuela
Plug trouble? I haven't had one issue with mine in its 21 years with me. Of course, you'll need to replace the Alternator wiring if you do the swap, but it's cost effective and a great improvement. Just do a search for 3G swap and you'll get plenty of good info on how to do it properly. As for durability, even to this day some Super Duty trucks use it, that's after more than 3 alt. gens later, that should tell you something.
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From: nebraska
Yes I was thinking of the 2G for plug trouble my bad. Yes We do have a large electrical load -- bale bed for moving round bales of hay. I would think the load to be similar to a snow plow a greater load but perhaps not as often as a plow would go up/down and angle. With really heave bales the load may be as high as 700 amps a dual battery set up on gas burners was a must with a isolator or ignition would die. High load(700) lifting for appx. 20-30 seconds then light load out(50) then heavy load back in 20-30 (700) so about 1400 amp draw in 1.5 min time calculated by measuring voltage drop on battery then using battery load tester to duplicate voltage drop and reading load. Any thoughts would be appreciated
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The Southernmost Mod
Joined: Dec 2004
Posts: 6,902
Likes: 21
From: Caracas, Venezuela
Do a search for the RJM 3g product, there are 130A to 200A products which should be enough. Personally I think a stock large case 3g should suffice with 130A to 200A. If you need more juice at lower rpm a smaller pulley will do the trick, but you need to research this further, too small and you'll smoke the alt bearings.
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