Got into the menu but needed a service code - looked on line just now and found 12425 for all Grisos. I'll try that. In fumbling for the button to enter and scroll through the menu, I hit the "trigger" for the high beam flasher and the headlight came on, so it's not the bulb - per the manual, the trigger bypasses the headlight high/low setting switch. I'll just tape the trigger down and ride it like that - just kidding, but I could if I had to. When the headlight came on, I could hear the gremlins giggling.
I checked the manual for the location of all of the fuses and their purposes. I had found them all but I was supposed to have checked the 3A and 15A fuses first before the 30A, but no explanation as to why.
Service code worked.
No ECU errors.
Dash errors 1, 7, and 8. 7 and 8 are related to oil pressure sensors, which from what I've read is not an uncommon problem for Grisos but the engine oil was drained yesterday and obviously the engine has not been started since.
Any diagnostic value in these for the electrical problem?
For anyone else who comes across this problem, an annoyingly jumbled, sometimes indecipherable, but still informative video on disassembly and connections of the dash module inside the housing. Most telling, the poster was not able to save his dash module with 180,000 kilometers but found a low kilometer replacement:
https://www.youtube.com/watch?v=QTf7BpwnS-g&t=11sFor anyone else who comes across this problem, disassembling the dash is a royal PITA. If I did it the way it's supposed to be done, you loosen the dash by taking out the four obvious large hex head screws, two on the top just forward of the triple clamp and two underneath the nosecone screwed in horizontally towards each other. Then take off the chrome nosecone with the four tiny hex screws on the top corners of the dash, then the three less obvious screws underneath. Lift the dash and wiggle it and the nosecone will slide grudgingly out from under, leaving the connecting cables exposed. Hang on the the two rubber grommets because if they're like mine, they're loose in their recesses and will fall out and roll. It's fun, not, reversing the process because you have to try to balance the grommets in the recess and not have them fall out, then put the dash and the nosecone together and orient them so you can get the two large hex heads back in. The real fun starts when you've finished putting in the four small hex head screws on the top and have to screw in the three underneath with a little wire hex wrench and no room to turn them so between a third to a sixth of a rotation each time you manage to get the little wrench in the little head.
That said, mine appeared to be immaculate inside - no evidence of water intrusion, just a few tiny spider skeletons. The contacts in the large connector were pristine, as were the two contacts in what I think is the power source for the dash. Maybe the board is bad from absorption of humidity but I saw nothing I thought looked like damage. Compliments to Moto Guzzi on the design of the large connector. I don't have much experience but I thought it looked elegant.
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