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ABS now Working! I spent the last few days as time permitted to add the surge protector and a relay so that both the Perm + and Switched + to the ECU are protected. Swapped out the bad ECU for the new one I purchased on ebay and all is working, ECU self test passes and the ABS Light goes out...

Here you go:

I did get an ECU and valve assembly from ebay. The 15A fuse blows as soon as power is applied, unplugging the ECU, fuse is fine so st least that rules out a short to ground in the cable but confirms the ECU is a gonner! I am about to add a surge protector to supply both the unswitched and...

Well the device I originally found was $150 and only good for 10A, so I found one of these for $50 which I will wire into the supply line from the PCB and protect all the circuits fed from that point, good for 150A load and clamps at 31V. NORTHERN TECHNOLOGY 24V SURGE PROTECTOR DCB-24SM

Possible Protection 'Brick' I found this on the web, funny it's a company localish to me! http://www.hdm-sys.com/pdf/hdm_vtp10-24_specs.pdf I have a call into the vendor for pricing and a call into Haldex to find out what the current draw is with both valves on (modulating.)

Mike, Thanks for that, did you ever take one apart? M.

From the conversation I had, it would seem that the protection diode fails, so that would point to opening up the PCB and replacing it (diode), I have never opened a PCB up, I think there may well be some threads related to the PCB that may help.

In the engine bay on the firewall drivers side, rectangular black box.

I have a thread in the 5 Ton Mods forum specifically addressing adding better protection, just need a few experts to validate my idea. http://www.steelsoldiers.com/5-ton-mods-hot-rodding/91110-abs-ecu-protection-ideas.html

So, I may have blown up my ABS ECU in my M923. In talking with a guy at Haldex who it turns out, put together the kit for the MWO for the ABS on the M939 Series truck. He told me that if the truck is shutdown incorrectly it’s likely that you will send a 100V+ spike down the 24v line and fry the...