ACR's
Grand HDF Member
Joined: Aug 2014
Posts: 3,621
Likes: 1,624
From: Eastern Ohio
The installation instructions for the ACR wire harness says NOT to start the bike before the ecm is updated or ACR failure can occur.
Instruction sheet
Instruction sheet
Outstanding HDF Member
Joined: Dec 2008
Posts: 2,007
Likes: 353
From: Ohio
The violet wire in the harness gets connected to ECM cavity 19. When the ON switch is pressed to start the bike the ECM connects ground to that cavity which opens the ACR's. The yellow wires in the harness are actually connected together. That's so either wire can power both ACR's AND act as a jumper to re-connect power to the fuel pump wire in 4-B because the battery power wire was moved from 4-A to 3-A. Now battery power starts in 3-A thru the fuse to 3-B (ACR's) then to 4-A then thru the fuse to the fuel pump (4-B).
Road Captain
Joined: Apr 2011
Posts: 610
Likes: 82
From: Indiana
What type of sound do they make? I don't think I have ever heard mine, but I believe they are working. Thx.
Last edited by dakotared; Apr 27, 2017 at 03:28 PM.
Tourer
Joined: Nov 2014
Posts: 325
Likes: 16
From: Miami, FL
I just did 103 and had head shave along with 030 head gasket to 10.25:1 ccp. I purposely try to crank motor before I turned on ACR with PV. Just to see where compression change starting. Acted like I had dead battery . Once I actives ACR in PV it fired right up..
I still can't heard ACR activing over fuel pump . As far as hurting ACR by not having them activated , If there closed when off how can u hurt them .. also the are location outside of The combustion chamber In a small milled out area.
Again if u have it wired right then all u need is dealer to active it. Just adding stage 2 map doesn't mean they activated ACR
If I paid for them to active ACR i go back to them and have dealer show me it's activated in my ecm. This is why I have PV = who needs dealer.
I still can't heard ACR activing over fuel pump . As far as hurting ACR by not having them activated , If there closed when off how can u hurt them .. also the are location outside of The combustion chamber In a small milled out area.
Again if u have it wired right then all u need is dealer to active it. Just adding stage 2 map doesn't mean they activated ACR
If I paid for them to active ACR i go back to them and have dealer show me it's activated in my ecm. This is why I have PV = who needs dealer.
Outstanding HDF Member
Joined: Dec 2008
Posts: 2,007
Likes: 353
From: Ohio
The installation instructions for the ACR wire harness says NOT to start the bike before the ecm is updated or ACR failure can occur.
Instruction sheet
Instruction sheet
I believe "ACR failure" here means that they won't open when starting the engine. As far as "severe engine damage" is concerned, I don't know how that could happen except if the ACR's would remain open after the engine starts. That doesn't seem likely. Or it could be one of those CYA warnings you see on a number of other H-D engine accessories like AC's.
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Cruiser
Joined: Oct 2014
Posts: 133
Likes: 1
From: Lake Ozark
Maybe my acr's are working when I hook up the harness, my big problem is the fuel pump does not come on when I move it out of 4a and put it in 3a next to the acr wire, when the fuel pump is in 4a it is next to a switch wire so the pump comes on
Outstanding HDF Member
Joined: Dec 2008
Posts: 2,007
Likes: 353
From: Ohio
The wire moved from 4-A to 3-A is the power wire from the battery. Not the fuel pump. The fuel pump wire is in cavity 4-B. It gets it's power from the second yellow ACR wire that's put in cavity 4-A. That's assuming there is a fuse there. And that the other yellow ACR wire is in 3-B. Also with a fuse to 3-A.
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Cruiser
Joined: Oct 2014
Posts: 133
Likes: 1
From: Lake Ozark
The wire moved from 4-A to 3-A is the power wire from the battery. Not the fuel pump. The fuel pump wire is in cavity 4-B. It gets it's power from the second yellow ACR wire that's put in cavity 4-A. That's assuming there is a fuse there. And that the other yellow ACR wire is in 3-B. Also with a fuse to 3-A.
Tourer
Joined: Dec 2012
Posts: 264
Likes: 10
From: NC
I installed the acr harness on my 08 sg yesterday. Pretty simple and easy to do took about 45 minutes in all. Used my power vision to turn them on worked like a champ. And it will not throw a code if they aren't hooked up and turned on in the ECM. if installed correctly you shouldn't have any problems. The biggest pain is the connector to the ECM getting all the wire pins reseated is the most time consuming part of the job. *** harley wanted 200.00 to install. I couldn't justify that being it's only moving 1 wire and installing 3. Hope you get it all worked out they are definitely needed with the slightest compression bump.now I have to install my T-MAN heads and I'll be set.