Power tilt connection point

[Kongfish]

Can anyone tell me where on my motor the power tilt wires in the photo I added connect to the wiring at?
Is there a free online service manual for mercury outboards
I have a 175 hp.
Year: 1990
Model 1175422OD
Carbureted
I"'d like to use a service manual for it.

[boats.net]

They connect to trim relays. Don't know where could get a free manual but can get manuals at http://northamerica.mercurymarine.com/