Wiring Diagram for rear window washer wiper

Am fitting a rear washer wiper unit to my 1990 T25 and am looking for a wiring diagram or any helpfull info on this subject. Thanks.

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Buy a manual here is this is a USA model http://www.bentleypublishers.com/product.htm?code=vv91
or maybe an online or downloadable manual here http://www.volkswagen.msk.ru / It has (http://www.volkswagen.msk.ru/vw_doc2/vw_transporter_91.zip ) which is for the VW Transporter 1991 (Vanagon) Full documentation (eng.) a 9 Mb file
maybe ebay.com #260067512616 or 300155646317
good luck!

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Buy a manual here is this is a USA model http://www.bentleypublishers.com/product.htm?code=vv91
or maybe an online or downloadable manual here http://www.volkswagen.msk.ru / It has (http://www.volkswagen.msk.ru/vw_doc2/vw_transporter_91.zip ) which is for the VW Transporter 1991 (Vanagon) Full documentation (eng.) a 9 Mb file
maybe ebay.com #260067512616 or 300155646317
good luck!

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Thanks for response, but my van is Type 3 not Type 4. I already have the relevant Bentley manual which only shows the front. I am looking for a diagram of the loom.
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