ST1300 Brains required for non starter

I think I've fixed it. Followed Annas Dad and Daniels instructions. 1.5volts throughout. Took off the ECU, 12v every where it should be. Checked the earths and power to the ECU, 1.5v in and good earth, no cables damaged. I though the ECU may be the issues, but why would it drag the system down. I went back to the fuse box, nothing obvious, same voltages on the fuse. Fuse out 12v supply. It wasnt putting up with a load, I thought!! Ripped out the relays and both fuse boxes and there it was. A corroded 12v supply to the section of fuses causing the problem! It was very bad and obviously would give 12v but not under load. Ripped it out and re-soldered it. Switched on and it works!! Yipee, just need to put it back together now. Will post some pics when I work out how.

Scotty said:

Ripped out the relays and both fuse boxes and there it was. A corroded 12v supply to the section of fuses causing the problem! It was very bad and obviously would give 12v but not under load.

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Yay! I had a sneaking suspicion that the UK's special brand of air and road crud might have had something to do with it.

I'll bet a fiver your dealer would have replaced the ECM by now.

--Mark

Good find Scotty! silicone grease on all the electrical connections would go a long way in avoiding this problem in the future.

Scotty said:

A corroded 12v supply to the section of fuses causing the problem!

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Great Job! Thank you for the detailed explaination and the pictures. Can you let us know which wire in the pictures was the cause and what was the location of that wire on the motorcycle? Reason I ask is that I ride in driving rain a lot.

Nice job on finding the problem. It must be all that nasty road grime filling the connectors I guess. Get all those connectors cleaned up and sealed. Hope you on the road soon.

Mike

Yes it must be the minging scottish weather and road salt. The wire that has caused this problem was a red and white ignition fed live. It fed the Fuse box that sits in front of the relays on the LHS of the bike. There are 2 red and white and one permenant live red. Each wire feeds 2 fuses. The rest of the wires were fine so there must be a water track somewhere that goes to this point. I've re aligned the wires and undone some twists and kinks so hopefully that will do it. It would appear now that a few folk in the UK have had similar problems which cost a lot of cash to fix at the dealers. It may be more of a problem on older bikes running in the wet as mine is an 04 and the others I am now aware of are about there or older. Hopefully you guys in the land of reasonable weather wont be afflicted. Thanks to everyone who assisted.

The first picture in the strip shows the fuse box at the LHS, in the middle of this is a green blob where the wire disintegrated. In the centre of the picture just off to 3 oclock is the wire, also a green blob.

Good job, now enjoy that feeling (in your best clarckson voice) "Fixed that myself, I did"

I love stories with a happy ending.

st1300r said:

Do you hear the relay click but no fuel pump whine when you turned the key to on?
Could be the relay isn't fully seated in it's connector, the rubber boot can make it look like its seated when it isn't..

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Thanks for the post. You helped me find the relay and the connector had come loose.