00 1500 wiper motor electrical issue

[comet240]

hi last year i had ice on winshield wipres froze i worked it and i guess burned out

i had replaced motor wasn't i and then found groun problem but it had burned that motor too when i bypasse the little black ground wire and just ran it to frame of truck worked for a bit then burned out the motor i guess

i got a replacement truck for parts it works in that truck put in ym truck no goo as i figured it was the mf switch.. nope if i put my ground wire to the motor works but i don't don't wanna burn it out...

but is here a wiring diagram or test procedure to knoe where that black wire goes too... so i can cut it off at base an run new wire to it... and is there a test to know if any of these wires melted so i can repair it.. or would it be just the ground wire shorting things.... as i don't want to short out it again like to make sure that not electrical is fused shorting etc... motors not cheap.... ohm readings or whatever procedures be great please

[comet240]

here is you tube video i took yesterday
https://youtu.be/st0vZgQYEuI
getting 12 volts on the ground don't think that's right

[Chris Stewart]

https://www.dropbox.com/s/s7xwosy8ar...geRam.pdf?dl=0