cunning plan
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- Jul 15, 2008
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- Northamptonshire
- Year of Your Van(s)
- 1968
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I have been researching the Earlybay, dash-mounted switch, windscreen wiper system as I want to make the system work using a toggle switch (I have a toggle-switch fetish, OK?) and a way of controlling the slow speed to give intermittent control, probably using a variable resistor.
Anyway, I have found this diagram:
[Original Wiring Diagram Credit: Telford Dorr, thesamba.com http://www.thesamba.com/vw/forum/viewtopic.php?p=6189324&sid=751a1592f4952751b5f8a7df3f694ed3#6189324" onclick="window.open(this.href);return false;]
So, it seems a clever, yet simple circuit.
In the off position, pin 30 on the switch provides +12V to 53a, which is a cam-driven switch.
When the switch is turned to 53 or 53b, power flows to the relevant points on the motor for slow and fast speeds - Got it.
When the wiper-motor is half-way through its cycle (using 53 or 53b), the cam-driven switch is closed which allows power to flow through 53e and turn the Bosch Cube Relay (coil) on using 85 and 86. This in-turn energises the relay to connect points 87 and 30 in the relay together and power flows through to 53 to allow the wipers to continue turning until the cam-driven switch 'turns off', which turns off the Bosch Cube relay and stops power flowing through 87 and 30, meaning the wipers have now 'parked' - cool.
Right, the parts I do not understand (unless I have the above wrong too :lol: :roll: ):
Why does there need to be an earth on point 87a in the Bosch Cube Relay, which is a Normally closed connection? Why does the switch need the earth (31b to 31)?
I want to put a toggle switch in to cover the functions of 53a, 53 and 53b, so would the system still work without that Earth (essentially, no point 31)?
Wiring!!! :? :sad0049:
Anyway, I have found this diagram:
[Original Wiring Diagram Credit: Telford Dorr, thesamba.com http://www.thesamba.com/vw/forum/viewtopic.php?p=6189324&sid=751a1592f4952751b5f8a7df3f694ed3#6189324" onclick="window.open(this.href);return false;]
So, it seems a clever, yet simple circuit.
In the off position, pin 30 on the switch provides +12V to 53a, which is a cam-driven switch.
When the switch is turned to 53 or 53b, power flows to the relevant points on the motor for slow and fast speeds - Got it.
When the wiper-motor is half-way through its cycle (using 53 or 53b), the cam-driven switch is closed which allows power to flow through 53e and turn the Bosch Cube Relay (coil) on using 85 and 86. This in-turn energises the relay to connect points 87 and 30 in the relay together and power flows through to 53 to allow the wipers to continue turning until the cam-driven switch 'turns off', which turns off the Bosch Cube relay and stops power flowing through 87 and 30, meaning the wipers have now 'parked' - cool.
Right, the parts I do not understand (unless I have the above wrong too :lol: :roll: ):
Why does there need to be an earth on point 87a in the Bosch Cube Relay, which is a Normally closed connection? Why does the switch need the earth (31b to 31)?
I want to put a toggle switch in to cover the functions of 53a, 53 and 53b, so would the system still work without that Earth (essentially, no point 31)?
Wiring!!! :? :sad0049: