ATTENTION ELECTRIC WIPER USERS:
At Shawnee I modified several GMCs with a variation on the electric wiper
slow-down mod. published at:
http://www.gmcmi.com/vintagerving/2017-WinterVintageRving/#p=16
After that publication appeared, it occurred to me that it would be quicker
and easier to insert the bridge rectifier in the Ground lead rather than
the Power lead. Every time I installed the mod., I did it that way. It
being such a simple change that we never tested it.
I've since learned from one owner, and experienced myself, a situation I
didn't anticipate: SOME Lumina wiper motors are grounded not only by the
pigtail's ground wire, but by the motor housing. In that case, the mod.
causes no problem, but it also does nothing to slow the motor.
So, if I, or you, installed the bridge rectifier in the Ground lead and the
wipers still run fast, that's probably the problem. You'll have to move
the rectifier IAW the published diagram.
Sorry 'bout that -- all my shop motors have isolated grounds.
Ken H.
Americus, GA
'76 X-Birchaven w/Cad500/Howell EFI & EBL,
Manny Brakes & 1-Ton, etc., etc., etc.
www.gmcwipersetc.com
At Shawnee I modified several GMCs with a variation on the electric wiper
slow-down mod. published at:
http://www.gmcmi.com/vintagerving/2017-WinterVintageRving/#p=16
After that publication appeared, it occurred to me that it would be quicker
and easier to insert the bridge rectifier in the Ground lead rather than
the Power lead. Every time I installed the mod., I did it that way. It
being such a simple change that we never tested it.
I've since learned from one owner, and experienced myself, a situation I
didn't anticipate: SOME Lumina wiper motors are grounded not only by the
pigtail's ground wire, but by the motor housing. In that case, the mod.
causes no problem, but it also does nothing to slow the motor.
So, if I, or you, installed the bridge rectifier in the Ground lead and the
wipers still run fast, that's probably the problem. You'll have to move
the rectifier IAW the published diagram.
Sorry 'bout that -- all my shop motors have isolated grounds.
Ken H.
Americus, GA
'76 X-Birchaven w/Cad500/Howell EFI & EBL,
Manny Brakes & 1-Ton, etc., etc., etc.
www.gmcwipersetc.com
