Technical Tips > Electrical-Electronics-Air-Lighting-Guages-Security-Vacuum

72 wiper motor not working.

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wabco40:

--- Quote from: Vettech on July 19, 2015, 09:08:58 PM ---That's a lovely blue. Does it look a bit purplish in the right light.

--- End quote ---

Not that I have ever seen. It just goes different shades of metallic blue.

69CVET:

--- Quote from: wabco40 on July 19, 2015, 08:47:33 PM ---
Hi Chris,

The open hose from the vacuum switch is normal as it is just a vent.

If the wiper door is opening and closing when using the wiper switch then the vacuum system seems to be in order.

Sounds like it could be the electrical limit switch on the firewall. When the wiper door is fully open a plunger pushes the switch in and completes the power circuit back to the wiper motor.
This needs to be adjusted so the switch is not activated until the door is fully open.

The picture shows the limit switch and the adjustable plunger between the wiper motor and vacuum actuator.



--- End quote ---

Thanks guys good info will be helpful..

Cheers

sirfixalot:
The wiper motor has constant  +supply on   red /white wire  supply comes via the switch under dash then the limit switch on firewall then to motor external wire & plug is a series circuit.The centre terminal on the 3 terminal plug is an accessory +. If the motor accessory + is turned off before the wiper motor parks it will stop & will loose the momentum which will open circuit the internal park contact inside wiper which then fails motor & won't restart. The motor has to be hot wired to restart it to then repark it.If you have a + on the external redwire & the centre terminal if you place a negative on the top  or bottom  terminal motor should run 

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