When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
I recently swapped a '95 engine with a 3G alternator into my '91 F150.
I wired it following this diagram (no conversion harness necessary) and it is working well.
Note: This is not my diagram. I found it online several years back and saved it.
I used the items below for my 4 gauge charge cable and mega fuse. My engine is not a 460, so you may need different lengths, but that company sells them in various lengths.
I did a 130 amp swap about a month ago my truck its a 93 f 350 with 7.5. what i use was a alternator from a sn95 mustang and i used the wire off a 2000 Lincoln Ls pop the trunk removed the spare tire and you'll find plenty of tight wire to do the whole swap plus it has a big fuse that you can use. send me a privet message with your email ill send you a video of the trunk of the Ls and some pictures of the alternator on my truck.
Don"t let this upgrade stress you, it is easy. As noted no harness needed. The "ASI" plug is the same between the second and third generation units.
Simply cut out the flaming connector and combine the power wires, solder on a 1/4 ring connector and or (depending on the amperage of your 3g) an additional heavy power wire. I used a 6 gauge in addition to the factory wires only because I dislike abandoning perfectly serviceable factory components.
Route the stator (white) wire from the flaming connector to the 3g stator connector, bolt the power wire(s) to the 1/4" power lug on the new alternator. I opted to ground the 3g to the chassis.
You really (really) should fuse or add a circuit breaker when you run an additional wire to the power side of the starter selinoid. The photo doesn't show it but I added a wire loom to the 6 gauge wire. I opted for a Powermaster 120 amp alternator and power wire. The breaker is a 150 amp unit from NAPA Auto Parts. Easy.
Another option - go to the salvage yard and grab the alternator harness off a newer 3G truck. You'll have to splice one wire but the rest is plug and play. That's what I did when we converted my brother's '88 to 3G. You'll be able to use a factory Ford 3G provided you have the necessary bracket.
I cannot speak to all but that is the only spliced wire needed on the 1991 2g to 3g. I added a 6 gauge positive wire out of an abundance of caution but that is the only spliced wire.
It's a thin green wire. Not exactly sure of its functionality, it may be the alternator exciter wire. Regardless, it has a plug but the plugs are different in the '87-'91 trucks than the '92-'96s. We cut the old one off before the plug and spliced in the 3G harness, retaining the 3G plug. I can get photos if you're still confused. The rest of the harness plugged in just fine, this was a factory Ford harness and a factory Motorcraft 3G.
It's a thin green wire. Not exactly sure of its functionality, it may be the alternator exciter wire. Regardless, it has a plug but the plugs are different in the '87-'91 trucks than the '92-'96s. We cut the old one off before the plug and spliced in the 3G harness, retaining the 3G plug. I can get photos if you're still confused. The rest of the harness plugged in just fine, this was a factory Ford harness and a factory Motorcraft 3G.
ah, ok. I didn’t realize yours was an older truck. mine’s an obs so the connector is probably the same, which is why I thought it odd it to splice it
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.
