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Hi Al, great minds think alike:-) I'm going to tear into the unit to figure out why she failed. Either a sticky vavle or the electrical unit is bad. I'll post pics of my dissection. Sounds like I'm back in biology class;-)

Well after 8 hours of work, turns out I have a bad/fautly ABS Solenoid Valve unit. I replaced the unit and now she self checks and the light shut off. I did a write up in my M925A1 build thread.

I just got this truck a couple days ago. Looks like the front relay valve isn't doing it's thing. The yellow (rear relay valve) is doing it's self check as it's suppose to. Just found out my non-start issue was due to a bad ground connection on one of my batteries. I disconnected the harness...

OK here I am with tonights work. Initial power up, the Yellow relay valve does the 3 clicks. However the Blue relay (ECU Body) does not do the 3 clicks. The ABS light is still on. I am not blowing the 15A nor the 3A fuses. When I am back at the ECU, I put my hand on it and do feel it click when...

Just replaced the fuse with the correct 3 amp one. Light stays on but NOW the 3 clicks are no longer there....hmmm. The mystery deapens. I've got a spare ECU that I'm going to just plug the electrical part into. I'll see if that works. If so then I'll hook up all the air lines etc.

Anyway to verify the ECU toast without the Haldex diagnostic Computer thing? When turning on the power I do get the initial 3 clicks from the ECU but not the second set that normally causes the ABS light to turn off. I also found I have a bad battery. I think it may have a dead cell. I still get...

Well, I'm in the middle of troubleshooting. I am now under the dash checking connections. I decided to check the fuses. The 15 amp looked good then my attention turned towards the Y off the starter switch and the 30 AMP fuse. The 30 AMP fuse looks good...WAIT....30 AMP FUSE?!?!?! Ahh, crud I at...

I am joining this thread because my newest truck has a steady ABS Light. When switching on the batteries, I hear the initial 3 clicks from the rear of the truck. But I do not hear the second series of 3 clicks where the ABS light shuts off. I'm going to try and look at the fuses tomorrow.