turn signal bypass

my current ride is an 82 xj750 maxim. when I bought the bike it had no front turn signals, because the previous owner apparently removed an after market interstate faring the guy before him put on. Well after using hand signals for the past year and a half, I finally got around to picking up a set of rear veiw mirrors with built in blinkers only to find that all the wiring has been cut and spliced so many times that it's a tangled up birds nest.
Is there an easy way to test what wires go where, or am I better off bypassing the original wires, and tying in directly to the flasher relay. If so how would I go about doing that.

 

find and fix the wires for the front light signals there are only 3 wires brown wire green wire and a double connector black wire and should all be bullet connectors .
are the lights in the mirrors led lights

 

wiring diagrams and key
http://members.tripod.com/dave_jack/wiringdiag/d10a.jpg

http://members.tripod.com/dave_jack/wiringdiag/d10b.jpg

http://members.tripod.com/dave_jack/wiringdiag/d8.jpg

 

the mirrors have leds, but the rear lights have already been upgraded to leds so it shouldn't be to much trouble.

 

check for a resistor set up for rear signals or should have an led flasher. do the rear currently work?
there are a couple of threads in the DIY forum on led converstion

 

The 750 Maxim has the systems monitor to deal with when switching to LED lights.
Thread below, including how to do the job and still keep the self-canceling feature.
http://www.xjbikes.com/forums/posts/114964/