1 ABS 1.5 and other problems (Posted originally on 24.11.2012) {long post} Sun May 26, 2013 6:14 pm
George R
active member
Hi all - a bit of a long post this but it might help someone in the future. To recap - K75 Ultima new to me, no history. Ign on and triangle light in binnacle always lit and ABS lamp lit. Bulb check feature and ABS not working.
Having taken in all the welcome help from the forum I started off by removing the Spyball alarm (u/s I thought it was the culprit) all its wiring , remade, soldered then put heat shrink on joints. Checked and repaired all the other damaged cables. Took off the binnacle and found burnt tracks in the wiring. leading to the Triangle bulb and a burnt motherboard in the Tacho part of the console. Taking every thing off in turn, found the wiring to clutch lever had been trapped in the past, probably with an over tight tiewrap and the exposed live wire had caused a dead short which seems to have caused the burnt binnacle wiring. Clutch switch cable, Motherboard and tacho board replaced.
Having got this working, I then removed the tail lamp wiring and replaced it with a less corroded part (Deoxit) and new bulbs and bulb holder. No change. Fitted a spare BMU but no change. Out of a further 4 BMU, only one was working!!!. One supplier I contacted said that he could not remember having sold one before. Borrowed another working BMU and this one also worked correctly. I wonder how many ABS systems have been removed because the BMU was faulty!
Trashed the faulty ABS test switch but repositioned the new switch into the relay box, then using the test proceedures (and the battery fully charged) - carried out all the tests on all the ABS components and found the small blue ABS relay was showing a very high resistance across the small terrminals. Another was tested - found ok and fitted. Went through all the tests again and found no faults, the Brain operating correctly and the ABS and other binnacle llights operating .
Having the rear wheel running in gear, applied a flap wheel on an electric drill to get the front wheel up to speed and found the self check had worked properly.
Took the bike out for a run and the ABS and the BMU were still working correctly after over 20 stops and starts. Once I get the bike away from traffic, I will try to see if it has "the chatter" though I am not hopeful - in 122K miles on my last K75 ABS, it only operated twice.
As far as I can now find out, this bike has been serviced by professional Bike mechanics and after what I have seen on this bike - like most on the forum, I would prefer the knowledgeable amateur to help rather than any alleged professional. I could write a book about the badly repaired problems I found.. I think if it had been my first K, at one point I would have gladly put a match to it..
Anyway - rant over - I hope the work is of interest to the forum and would be happy to answer any queries.
Now to start all the other jobs to do on it before the trip to Southern Germany!
Having taken in all the welcome help from the forum I started off by removing the Spyball alarm (u/s I thought it was the culprit) all its wiring , remade, soldered then put heat shrink on joints. Checked and repaired all the other damaged cables. Took off the binnacle and found burnt tracks in the wiring. leading to the Triangle bulb and a burnt motherboard in the Tacho part of the console. Taking every thing off in turn, found the wiring to clutch lever had been trapped in the past, probably with an over tight tiewrap and the exposed live wire had caused a dead short which seems to have caused the burnt binnacle wiring. Clutch switch cable, Motherboard and tacho board replaced.
Having got this working, I then removed the tail lamp wiring and replaced it with a less corroded part (Deoxit) and new bulbs and bulb holder. No change. Fitted a spare BMU but no change. Out of a further 4 BMU, only one was working!!!. One supplier I contacted said that he could not remember having sold one before. Borrowed another working BMU and this one also worked correctly. I wonder how many ABS systems have been removed because the BMU was faulty!
Trashed the faulty ABS test switch but repositioned the new switch into the relay box, then using the test proceedures (and the battery fully charged) - carried out all the tests on all the ABS components and found the small blue ABS relay was showing a very high resistance across the small terrminals. Another was tested - found ok and fitted. Went through all the tests again and found no faults, the Brain operating correctly and the ABS and other binnacle llights operating .
Having the rear wheel running in gear, applied a flap wheel on an electric drill to get the front wheel up to speed and found the self check had worked properly.
Took the bike out for a run and the ABS and the BMU were still working correctly after over 20 stops and starts. Once I get the bike away from traffic, I will try to see if it has "the chatter" though I am not hopeful - in 122K miles on my last K75 ABS, it only operated twice.
As far as I can now find out, this bike has been serviced by professional Bike mechanics and after what I have seen on this bike - like most on the forum, I would prefer the knowledgeable amateur to help rather than any alleged professional. I could write a book about the badly repaired problems I found.. I think if it had been my first K, at one point I would have gladly put a match to it..
Anyway - rant over - I hope the work is of interest to the forum and would be happy to answer any queries.
Now to start all the other jobs to do on it before the trip to Southern Germany!