1999 F250 5.4l base work truck.
My problem is wipers, washer do not function. It all started with my wipers staying on. I removed the fuse to stop them. When i put it back in nothing. I have bench tested all relays, checked fuses, put in a new mfs, put in a new/used gem, checked all wiring i can seem to find, refreshed grounds etc. I am starting to lose my mind with this thing.
I have gone through all of section A and B of these tests
http://ww2.justanswer.com/uploads/s4...sher_tests.pdf
except for the NGS scan tool.

Tonight checked the pins at the central junction box relays to see what was going on. This is where things got interesting. i have constant power at pin 5 of the run/park relay. if i jump this to pin 3 the wipers run. Pin 5 of hi/lo and washer show no voltage, however show continuity to ground. pin 5 of run/park also shows continuity to ground. with the key on i have 12v at pin 1 of the hi/lo, run/park, and washer sockets. when cycled through the switches show i have continuity to ground on pin 2 of all sockets as they should. However, when relays are in place they do not "click" over.

What am I missing here? any ideas welcome.
As much as I'd hate to do it, I may end up just throwing a switch in to "jump" the run park relay for temporary single speed wipers.

 

Multi-function switch on the column?

 

it has a brand new Multi function switch, and it has been tested ok.

 

well i may have found the problem. the 12v showing to pins 1 on all sockets disappears with any load applied such as a test light. DOH! i'm thinking the splice where these all join must be compromised. now to tear apart the entire wiring harness to find the splice.