'82 Wipers
I have an '82 and my wiper interval doesn't work, i have to constantly reach down and push the button if i don't want them to go constantly on high or low. which gets pretty irritating:willy: . Can someone point me in the right direction to fix this???:cool:
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Originally Posted by Stingray.1982
(Post 1563666208)
I have an '82 and my wiper interval doesn't work, i have to constantly reach down and push the button if i don't want them to go constantly on high or low. which gets pretty irritating:willy: . Can someone point me in the right direction to fix this???:cool:
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your year has a pulse relay, probably behind seat in trapdoor that controls
wiper function. look below trap door on pass side. |
My relay made constant clicking sounds until I finally unplugged it. I haven't found a replacement. Let me know if you find a supplier.
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Have Three Or Four Left In My Shop Inventory.
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Originally Posted by A88FXRS
(Post 1563675195)
Have Three Or Four Left In My Shop Inventory.
Thanks Steve |
I think that relay is no longer being manufactured. There's a guy on this board who rebuilds them...
I'll repost if I can find his name. |
Originally Posted by A88FXRS
(Post 1563674096)
your year has a pulse relay, probably behind seat in trapdoor that controls
wiper function. look below trap door on pass side. |
Originally Posted by A88FXRS
(Post 1563675195)
Have Three Or Four Left In My Shop Inventory.
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80-82 wiper troubleshooting
Here is the wiring diagram
http://photoshare.shaw.ca/image/6/8/...etwipers-1.jpg Motor White-power to motor Purple- low/high speed signal, taken to ground when wipers are on Gray- High speed signal, taken to ground when wipers not on high pink- wipers in delay stop position, grounded by switch in motor cover black - motor ground, connected at bell housing wiper switch dark green- delay control, grounded in every position but delay brown- voltage source to delay adjustment white/black- variable voltage signal from delay adjustment gray- instrument lamp power purple- low/high control, grounded in every position but off gray/black- high control, grounded in every position but high black- ground pink-washer control, grounded when washer button is pressed wiper controller dark green- delay signal, taken to ground when not in delay brown- voltage source from wiper controller for delay adjustment purple- low speed control, grounded while/after washer is on white- power to motor, on except during delay stop brown/white- power to controller pink- washer signal, taken to ground when washer is on pink/black- washer control, taken to ground when washer is on or delay position control, taken to ground when wipers in delay position white/black- delay adjustment signal next installment will be on the wiper controller circuit. |
here is a start to the circuit drawings
http://photoshare.shaw.ca/image/6/8/...llertop1-0.jpg http://photoshare.shaw.ca/image/6/8/...drawing2-0.jpg more later |
here is the complete drawing
http://photoshare.shaw.ca/image/6/8/...drawing2-0.jpg and the picture. I have removed the relay and the power transistor http://photoshare.shaw.ca/image/6/8/...llertop2-0.jpg next will be the test proceedure :cheers: Dale |
Nice post Dale
I have done the same research as you years ago and come to the same conclusions. Funny thing is that you live close to me! (Kelowna) Guy's Mr Wilson has given you everything you need here to fix your delay wipers on all 78-82 corvettes. Follow the diagrams closely and work your way through them. Most likely your controller needs some repairs. Do a search for dalewilson99 on this forum for the fixes. There was also someone from the UK that listed the part numbers for the controller electronics. The costs to fix the electronics are less than $20 and are a very easy fix. The next problem lies with the wiper motor; a pin that rotates within the motor activates the delay. There is a pink wire that is connected to the outside of the motor cover. When the pin comes around and touches the pink wire the delay starts. The pin within the motor wears against the internals, as it wears it wobbles, thus missing the contact with the pink wire, therefore no delay. The motor is a simple fix as well, or get a new one and change the cover over to the new unit. |
parts and fail rate
I agree with Sean82 about the delay switch in the wiper motor cover.
I rebuilt mine, it is a wear part. Going to Kelowna tomorrow!!, take wifey there for a two days. I have tested/repaired about 10 of these controllers all had something wrong with them. Part replacement fail rate symptoms D1 1N914 10% ? Q1 MPSA14 10% relay would not switch D2 1N4148 0% D3 1N4002 0% D4 1N4002 0% D5 1N4002 0% Q3 D40C1 or MPSW45A 30% no wipers or wipers always on ZD1 1N4735A 50% delay issues, always replace Q5 TIP42C 10% no delay Q6 MJH6284 60% no delay/wipers, replace IC1 MC14011B 10% posessed wipers!!! C1 10uf 16V Replace these on spec C3 33uf 35V C4 1uf 50V C5 1uf 50V C6 1uf 50V :cheers: Dale |
It could be as simple as the wiper switch. Ther is a guy in Hawaii parting out an 82 I be he still has the switch and the relay. Check the parts for sale section you will find him. his name is Davyn.
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Originally Posted by bluesilver82
(Post 1564066796)
It could be as simple as the wiper switch. Ther is a guy in Hawaii parting out an 82 I be he still has the switch and the relay. Check the parts for sale section you will find him. his name is Davyn.
Jim |
The wiper switch is also an easy fix if you have the patience. Take it apart, clean it and make sure the contacts are all working.
Dale, I am in Vancouver for a few days, - suggest we meet in the spring when the cars are out of storage. I could show you my cruise control fixes, if you have not already figured them out. Too bad this post could not be made some kind of sticky, -all 78-82 vettes will require Dale’s information at some point. |
torubleshooting wiper controller
I hook up the thing on a work bench.Red +12 volts black ground
http://photoshare.shaw.ca/image/6/8/...imgp2073-0.jpg 1-Test ZD1 Between pin 14 and pin 7 of the IC there should be 6 volts. Be Careful not to short out pin 7 if you do ZD1 will be shot. 2-test the relay cct. ground the dark green wire, the relay should switch. lift the ground relay will switch back. 3-washer control ground the pink wire. pin 3 sould go from 6v to 12v,pin 11 from 12v to 6v, junction of R5 and Q3 should go to 12v and the purple wire should go to 0v. remove the ground the circuit will switch back after a time delay of 5 seconds?? 4-delay control momentarially touch ground to green pin 8 of ic 6v momentarially touch ground to pink/black, pin 8 of ic 12v repeat ground cycle, pin 10 goes from 12v to 6 v touch green, 12v at junction of Q4 and R15 12v at junction of Q5 R16 12v at white wire, may have to remove relay to see this change. As always, you can send me the part and I will fix it for you. :cheers: Dale |
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