"Lucas, Prince of the
Intermittent Windsheild Wiper"
or,
How to Make a Real One!
An Article by Ed Esslinger
June, 2002
Page 2
- GOOD AND BAD WIPER OPERATION
There seems to be a question on just how and why Rootes wired the wiper motor the way they did. Let me try to explain the good and bad points.
- The wiper motor receives 12V anytime the IGN switch is on. GOOD this allows the wiper motor to run to its parked position when you turn off the wiper switch. BAD if you forget to turn off the wiper switch and allow them to park before you turn off the IGN switch, the wipers will stop wherever they are at the time. BAD even if you notice that you have left the wiper switch on and turn it off, after you turn off the IGN switch, the wipers will run across that dry and dirty windshield to the park position as soon as you turn the ING switch back on.
- One way to correct the problem would be to supply 12V to the motor at all times. GOOD If you turn off the IGN, the wipers would continue to run and then go to park when the switch is turned off. BAD the wipers will continue to run if you forget to turn off the wiper switch.
- Another and better solution is a circuit that ensures that the wiper motor receives 12V only when needed GOOD, and supplies it long enough to ensure it parks whenever the IGN switch is turned off, regardless of the position of the wiper switch at the time. Whenever the IGN switch is turned back on the wipers will not operate until the wiper switch is put to the off position first.
- Grounding the various wires at the wiper switch and the ground wire at the parking switch controls the wiper motor. GOOD if everything is connected correctly. BAD if the wires get mixed up at the switch or the three connections at the motor. At the switch if the N/LG wire is grounded alone the motor will not run and it will overheat. The N/LG wire and the R/LG wire must be grounded together for the motor to run at the slow speed. The R/LG wire only, is grounded for hi speed.
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