Need help from electrical gurus

Background : this bike, my 98 VFR800 was wrecked from prior owner and he patched the wiring back together. It's been running great (dynamite mechanically) but the electrical is giving me a headache.

Problem: I was riding home and all of a sudden lost spark. Pulled over and looked at fuses, main fuse blown and Fuel Ignition Fuse blown. I looked through wiring and can't see any obvious shorts to ground. I used a multimeter and checked resistance through stator 3p plug and all are about 0.1 ohm or 0. I checked the 4p plug that attaches to 4p plug of R/R (with ignition off) and it read 8.3 v (DC setting multimeter) and manual says this should be same as battery reading which is currently 12.3 V on my bike. When I replace the fuses after checking my wiring, it it's fine with my kill switch in kill mode but instantly blows the fuel ignition fuse.

I'm stumped, I've visually inspected my wiring and I don't see a problem, can anyone suggest a good way to continue my problem solving in this situation?

Thanks in advance,
Keeping a 90k mile+ VFR alive

PS - Losing spark 1.5 miles from home and being too stubborn to pay for another tow lead to me pushing the bike the whole way home...including on a pedestrian path through a tunnel that connects Alameda and Oakland... what a day

 

with a wrecked bike that's patched together you might expect problems. sounds like a short to ground , so just start unplugging couplers until problem stops, then work from there.

of course if this is in main wiring harness because of crash damage, GOOD LUCK....it could burn down before you find the short!!

 

You mean burn down because I light it on fire out of frustration ? Possible :biggrin:

It had a short to ground once before because he restricted the wiring harness's movement and turning the handlebars left to right ended up wearing through the insulation and shorting a couple wires. Which I soldered back together and then reinsulated.

I talked to a couple friends who are mechanics, one's response was: Wiring doesn't screw up unless someone hacks into it doing mods... So true.

Now I have a friend coming over who is used to troubleshooting electricals on cars and bikes. I'll post if it turns out to be anything interesting.

 

If I understand right the fuse blows when you switch the kill switch to "run". Did you check the fuel pump? It could be shorted.
Ohm it or disconnect it and see if the fuse still blows when you flip the kill switch.