Why do my 78 C10 wipers only go 1 speed?

[strnge]

Why do my 78 C10 wipers only go 1 speed?  I turn them on and they only go one speed.  It has 2 notches.  I bought the kit to make it a delayed wiper set up, but have not recieved it yet.  If I put it in, will it work properly?

[VileZambonie]

Do you have a meter? which speed does it run at? low? High? Also which motor do you have? Is it more square or round? If you are unsure then post a pic.


*MOTOR OPERATES AT HIGH SPEED ONLY


Ensure electrical connector to gear box relay is secure, turn ignition on, and place wiper switch in low position.
Connect jumper wire between terminal 3 on gearbox relay and ground, leaving harness connected.
If motor operates properly at low speed, check continuity between wiper motor and switch, switch continuity and ground, and repair as needed.
If motor does not operate at low speed with terminal 3 grounded, motor is defective.
MOTOR OPERATES AT LOW SPEED ONLY (OPERATES PROPERLY IN DELAY & PARKS PROPERLY)


With ignition on and wiper switch in high position, disconnect electrical connector to gearbox relay and connect test lamp between terminals 2 and 3 in connector.
If lamp fails to light, check continuity of wiring between motor and switch, switch continuity and ground, and repair as needed.
If lamp lights, motor is defective.
MOTOR INOPERATIVE IN DELAY MODE


Place wiper switch in mid-delay position and disconnect electrical connector to pulse timer at wiper motor.
Connect ohmmeter between pulse timer terminal on motor and ground.
If meter indicates continuity, motor is defective. If meter indicates no continuity, replace wiper switch.