How on earth do you lose ground?

so, my bike was almost ready to go, buttoned up all lose ends, turned the key, nothing, only electronics on was my taillight because it's grounded to the frame, I hear the relays come on, i get juice to my lights, but when i turn the dial on my manometer to the thing where if theres a connection, it makes a noise, and i dotn get the noise when i go from the ground of my lights to the frame.. so is thereanyother spot where the system grounds to the frame besides the cable going to the battery?

also, what's the blut wire from the ignition with the fuse for? it had a blow fuse, but then i touch the two ends together nothing happens.

 

Chances are, not sure where to look on a 700 one on my Baby Max there's a 2nd ground by the Reg/rect unit

 

It feeds into the main dash cluster circuit, and the tail-light, among other things......

 

i think i've found 4 grounds on my maxim 650. i'd have to go out to garage and list them all.

 

I ran a jumper for my tail light... , unfortunately, the bike "fixed" itself, i must have turned the key on and off 100 times, and lights still came on, etc. i'll look for more grounds and clean contact points...

also, does anyone know if the solonoid would have anthing to do with ground? or are both little wires coming out positives?

 

the red wire goes to the starter circuit cut off relay.

the blue wire comes from the right hand handle bar switch