1980 LTD/Mercury, windshield wipers timer/relay ( black box, on column under dashboard)

I need to repair the part numbered D9AF 17C476-AA (wiper timer relay) of a 1980 LTD car. The model with two relays and on one side various wires, those connected to two squared terminals, one to the wheel switch on column, the other to dashboard connections...  To repair such difficult to find here i could use the electrical diagram with resistors and components values , or eventually a good well scaled pict of the circuitry (component side to read the visible values needed) would be welcome at   ba1(a)live.com.mx  to replace a few overheated components burned and therefore unidentifiable.  Here i could find, if needed, other parts of Ford cars and trucks if needed, and send those ... thanks , and waiting for good news..> Pat