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Wiring depends on which type of window motor u have .
Most early GM had 2x positive feeds to the w/motor 1x was down 1x was up
The ground was thru the motor case then door then earth

Silicon water proof electric grease every where all elec connections
earth wire from motor to body point
Install door liner behind door trim to keep water moisture out . Stick clear plastic sheet down with butyl rubber strips .
Most often power comes from the permanently live side of fuse box to the main relay //from the relay it goes to the drivers door switch . Power can only happen if the relay is energised by the ignition being turned on .

****yup doing all 4 of my GM windows

Motor clean and new brushes is most likely needed
Lubrication of worm gear with PTFE white grease
inspect ALL ALL weather seals and ... rollers
Lube window rollers with Zinc grease
lube runners with silicon spray
 

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hi
Doing my window motors now
.....slow windows can be caused by many things .
1/ window channel adjustment s
2/ window channel roller and motor grease dried out and sticky
3/ hard window rubber seals
4/ dirty commutator inside motor
-----B4 14amps usage and slow
-----After cleaning 6amps and alot faster
5/worn motor brushes
6/ incorrect grease in motor worm drive ,, worm drives are very very hard on grease
7/ window mechanism rollers worn out

NB donot use aftermarket motors the brushes are very short and the casings are not water proof rubber coated . Depends on OEM vehicle the motors . the good ones are ....rubber dipped .....
If your motors are painted
bead blast case
epoxy prime
use a brush rust prevention wax once assembled .
 

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hi
Are your motors rubber dipped and assuming they look similar to this
Gas Metal Auto part Composite material Circle

This seems to be a OEM Delco Pontiac type flat style driven gear with housing being rubber dipped .

The aftermarket Corvette style has a different lower quality /non water proof seal , different looking driven gear with a painted body

Can u still buy new these OEM motors/ driven gear eg NOS ??

The rubber dip and better sealing driven gear seem to only occur in some NOT all variations of this motor .
 

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Hi
Yes the brushes are a little hard to get the correct types and size
Brush spec is
1/4 x 1/4 x 1/2 long [ 6.3 x6.3mm x 12.7mm ]
side connect shunt wire braid
BRush Grade
copper/ metal graphite [high amperage for size ] [handles approx 8amps constant at low volts ]
NB warning lesser carbon brush Black electrographite will burn out , very common brush .

BRAND hellwig STYLE 13-H or similar
OR
Back- And Side-Shunted Brushes (carbonbrush.com)

I just purchased 2x vehicle sets [16] [4dr] from this company , should arrive this week .
Australian Gm used these 1970--1985 So i have Chevelle radiator and elec motors and some suspension from Chevelle of all different years . !!!! wow
 
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