Well, after way more time than I thought it would take, I have successfully installed the 12v accessory outlet. The problems all started with the battery tender cable. Not the fuse but the cable itself. So I took it out. Ran my wires directly from the battery. Installed a SAE connector so I can simply unplug it if I need to. Put an in-line fuse holder on the hot lead with a 7 1/2 amp fuse. Soldered everything up and tested it and it works great.
After removing the battery tender cable I discovered that I now have power to the accessory plugs under the seat and in the headlight bucket! How weird is that!?
All this just so I can see how far off my speedometer is. So I went for a short ride to see. The results were amazing. 20 mph on speedo = 19 on gps. 55 on speedo = 50 on gps. 77 on speedo = 70 on gps. No wonder people were climbing up my butt! After fabricating a bracket for the outlet and a windshield bag next weekend I'll have to see what can be done to fix that.
Thanks for the help and the ideas!
Great to here you found the problem, I know what you mean about people climbing, wondered the same myself till i checked on a hand held unit.
Yes the speedo is off by about 10% on almost all 900's, might be one that came messed up and is actually correct but i have not heard of one, the error is designed in to prevent law suits for showing to low a speed. Honda got suied and lost in Europe.
So I know of three options to correct, and one to ride anyway. Do quick math when looking at it, 70=63 60=54 50=45 , or fixit.
2 options are commerical and 1 is posted in a thread if you are a wrench.
Speedo Healer is electronic correction of signal to speedo.
The other is the overdrive belt rear wheel pulley with two different options.
Both have major threads about them.
Have a great ride.