electrical gremlins..

[jonzcustomshop]

I started on hooking the taillights on the wifes 63 step today.
I found a ground, and then with a test light found
lh turn
rh turn
running, r&l
brake ,r&l
I stopped, wrote everything down, and then proceded to hook up the lh taillight.
no blinker-
hooked the right wires to the left, got the right blinker, so the bulb and light housing should be good.
after some trying around I got everything hooked up, had all lights at the rear , except for the lh blinker.
a test light to the connection showed no lh blinker still, so I chased up the harness a bit, and found an old splice. I unwrapped the tape and started testing in front of the splice to find the lh blinker.... now both the brake lights (that did work) do not work anymore.....
so now I am down to rh blinker(works, and running lights(work).
through all of this the lh and rh blinkers still worked up front, so I assume the flasher is still good....
giving up for the night..
any ideas of what the problem is , where to look next?