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That is one place I have added the wire for the GP manual switch. Fleabay usually has the paper manuals. Be aware that some sellers don't say and they ship you a CD with the free PDF manuals You might also contact rapcoparts.com. They have had CUCV paper manuals in the past.

The GP relay is the unit next to the master cylinder. The stock unit really doesn't have issues unless it is old and the internal contacts are carboned up. If you replace it, it must NOT use the housing as a ground for the coil. If you do use the wrong type then the relay will be energized all...

Here is a quick wiring diagram for the GP system with the manual switch added.

The way the stock GP system works is this: When the key is on, 12v is supplied to the GP relay coil at all times. When needed the the GP controller will "turn on" the ground wire and the relay energizes. At the relay the small pink wire is the 12v supply and the small blue wire is the ground...