#Subaru 3 wire alternator wiring diagram mod#
#Subaru 3 wire alternator wiring diagram upgrade#

Ideally, it should be connected to the positive terminal of the battery, as the alternator should 'sense' the voltage there and charge accordingly. How you have the 12V+ hooked up to the 'sense' wire matters.

#Subaru 3 wire alternator wiring diagram upgrade#

Posted: Wed 7:39 pm Post subject: Re: 110 amp alternator upgrade for your Subaru conversion CHEAP If they didn't upgrade them from stock it would be a good idea. Posted: Wed 6:23 pm Post subject: Re: 110 amp alternator upgrade for your Subaru conversion CHEAP gauge wire goes to black box, confirmed all connections good.Ĩ4 Westy Syncro- 3.3L SVX stage 2 tune,subaru gears 6speed with tbd, front locker, porche brakes x4, aux tank, radflo susp Swapped alternator with a know good, same. interstingly when the green plug is unhooked from the alternator it goes up to 14+ volts? when measured the voltage at the batt is 12.6 under load. Has been running fine for 6k miles and now all of a sudden the alternator is putting out less than 13 volts when under load and the charge light is coming on.

#Subaru 3 wire alternator wiring diagram mod#

So did this mod a few months back, or rather it was done for me at the time of my syncro swap. Posted: Wed 3:07 pm Post subject: Re: 110 amp alternator upgrade for your Subaru conversion CHEAP I even contacted Jeff at autoventures, who did my original harness for confirmation.ġ984 | Vanagon Tin Top | Subaru EJ25, 5 Speedġ986 | Vanagon Syncro | Restoration to bone to top I read all the threads here on this topic a few times and didn't see anything outlining conversion from existing 2 wire alternators with a different plug type like I have. Connect the black small wire to the light pin (closest to the big B+ lug). So if you are upgrading an EJ25 with a 2 wire alternator, connect the large white wire to the sense pin, which according to resources in this thread, is the center pin. You can cut this lead off, it goes unused. If you look at the image on the amazon plug, there is a diagram of the alternator side of the plug.īlack lead is 'D' otherwise known as 'C' for computer. The large white wire is the 12V+ or SENSE wire.

The black and yellow wire is the gauge/cluster light wire. On my 2 wire alternator plug, there is a 10 gauge white wire and a smaller gauge black wire with a yellow stripe. Posted: Sat 4:18 pm Post subject: Re: 110 amp alternator upgrade for your Subaru conversion CHEAPįor anyone coming here looking for wiring who has a 2 wire subaru alternator here is what I have found. A wire connection from the alternator to the indicator light in the dash will activate the lamp when grounded and turn it off when 12V is applied. The dash light operation is non-intuitive. You could also check the black/red? wire with a meter. The large white is likely 12V+, but you should check that with a multi-meter. I don't know how your existing two-wire alternator is connected. Posted: Sun 9:50 pm Post subject: Re: 110 amp alternator upgrade for your Subaru conversion CHEAP Thanks for that, do you know what the two existing wires are by chance? can i reuse either? Posted: Sun 2:31 pm Post subject: Re: 110 amp alternator upgrade for your Subaru conversion CHEAP This page may contain links to eBay where the site receives compensation. Quick sort: Show newest posts on top | Show oldest posts on top 110 amp alternator upgrade for your Subaru conversion CHEAP