Intermittent Wiper Relay |
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Intermittent Wiper Relay |
Geezer914 |
Feb 23 2023, 01:27 PM
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#1
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Geezer914 Group: Members Posts: 1,418 Joined: 18-March 09 From: Salem, NJ Member No.: 10,179 Region Association: North East States |
72 in South Jersey, so I took the Porsche out of hibernation and went for a drive. Over the winter I installed an intermittent wiper relay with the factory harness. As I am driving, the wipers kept turning on no matter what the position the switch was in. I stopped and pulled the relay and the wipers worked normal on hi & low and stayed off with the switch in the off position. How do I test this relay?
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jim_hoyland |
Feb 23 2023, 03:29 PM
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#2
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Get that VIN ? Group: Members Posts: 9,302 Joined: 1-May 03 From: Sunset Beach, CA Member No.: 643 Region Association: Southern California |
Possible grounding up intheswitch ? I never experienced what your IW does; but, I do get ghost wipes occasionally. The consensus is the the with has a loose or faulty ground.
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Geezer914 |
Feb 23 2023, 03:45 PM
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#3
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Geezer914 Group: Members Posts: 1,418 Joined: 18-March 09 From: Salem, NJ Member No.: 10,179 Region Association: North East States |
After I pulled the intermittent relay, the wipers did not come on again. If I activated the wiper switch. they worked in the low and hi position. So I think that would rule out the wiper switch. I double checked the wiring according to Bowlsby's library and everything checks out. I just have to figure out how to test this relay with a 9 volt battery.
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914Sixer |
Feb 23 2023, 08:50 PM
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#4
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914 Guru Group: Members Posts: 8,883 Joined: 17-January 05 From: San Angelo Texas Member No.: 3,457 Region Association: Southwest Region |
URO reproductions available for around $20. Have rarely seen a bad relay, but it happens. Check grounding screw in steering column.
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jim_hoyland |
Feb 24 2023, 02:31 PM
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#5
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Get that VIN ? Group: Members Posts: 9,302 Joined: 1-May 03 From: Sunset Beach, CA Member No.: 643 Region Association: Southern California |
What happens when you move the wiper switch down from the off position that would be the intermittent mode.
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Superhawk996 |
Feb 24 2023, 03:25 PM
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#6
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914 Guru Group: Members Posts: 5,829 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch |
The smart (IMG:style_emoticons/default/bootyshake.gif) in me wants to say the schematic for the relay is right there - printed on the side
Trying to be more helpful. . . I think you will need 12v battery - don’t assume 9v will do it. May not be enough current to drive the solenoid and/or timer internal to the relay Looking at schematic for vehicle 31 - ground 15 - 12v power into the relay 53s & 53m are the relay contact - leave pin 53s disconnected. Monitor pin 53m with voltmeter - should alternate between 12v and 0v as relay clicks S - this is the ground coming though the wiper switch that triggers intermittent relay to ON - that ground is noted in black line with arrow on the attached photo |
r_towle |
Feb 24 2023, 03:33 PM
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#7
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Custom Member Group: Members Posts: 24,574 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States |
Curious,
What makes it intermittent? Heat? Meaning how does it not come on at a regular frequency? |
jim_hoyland |
Feb 24 2023, 03:49 PM
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#8
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Get that VIN ? Group: Members Posts: 9,302 Joined: 1-May 03 From: Sunset Beach, CA Member No.: 643 Region Association: Southern California |
You saw Sir. Andys thread ?
http://www.914world.com/bbs2/index.php?showtopic=2094 |
dr914@autoatlanta.com |
Feb 24 2023, 04:25 PM
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#9
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914 Guru Group: Members Posts: 7,866 Joined: 3-January 07 From: atlanta georgia Member No.: 7,418 Region Association: None |
not the relay one of the screws that holds in the switches is loose and not making a ground
72 in South Jersey, so I took the Porsche out of hibernation and went for a drive. Over the winter I installed an intermittent wiper relay with the factory harness. As I am driving, the wipers kept turning on no matter what the position the switch was in. I stopped and pulled the relay and the wipers worked normal on hi & low and stayed off with the switch in the off position. How do I test this relay? |
Superhawk996 |
Feb 24 2023, 08:27 PM
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#10
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914 Guru Group: Members Posts: 5,829 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch |
Curious, What makes it intermittent? Heat? Meaning how does it not come on at a regular frequency? Let me 1st say I’ve never taken one of these relays apart. Based on the schematic in the factory manual that shows a transistor symbol and the relay that shows a square wave, I’m going to guess it’s some sort of astable flip flop circuit with timing controlled by a resistor-capacitor circuit. That flip flop circuit then Triggers the solenoid on either the high pulse or the low pulse. Based on the schematic on the relay - I’m going to guess it triggers on the high pulse . It will trigger on a steady frequency. Intermittent in the sense of 1970s technology - not variable frequency like todays intermittent wipers. As stated - if someone has dissected one and I’m wrong - please correct me. @“r_towle”. |
Geezer914 |
Feb 25 2023, 08:49 AM
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#11
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Geezer914 Group: Members Posts: 1,418 Joined: 18-March 09 From: Salem, NJ Member No.: 10,179 Region Association: North East States |
Pulled the steering wheel, wiper switch screws were tight. If the screws were loose preventing a good ground, then the wipers would have been acting up before I installed the intermittent relay.
Ordered a new relay. |
Superhawk996 |
Feb 25 2023, 12:39 PM
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#12
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914 Guru Group: Members Posts: 5,829 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch |
What? You’re not even going to test the old one?
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Front yard mechanic |
Feb 25 2023, 01:58 PM
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#13
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Senior Member Group: Members Posts: 1,164 Joined: 23-July 15 From: New Mexico Member No.: 18,984 Region Association: None |
Only use the relay when it’s raining
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76-914 |
May 12 2024, 07:04 PM
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#14
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Repeat Offender & Resident Subaru Antagonist Group: Members Posts: 13,503 Joined: 23-January 09 From: Temecula, CA Member No.: 9,964 Region Association: Southern California |
Just saw this........a little too late maybe. Anyway, I went down this road last week. Look at the backside where the wires enter the socket for the relay. If the brown wire gets pushed out of its nest in the socket you will be able to. see the very end of the non-insulated crimp terminal. Symptoms are exactly what you described above. (IMG:style_emoticons/default/beerchug.gif)
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jim_hoyland |
May 14 2024, 04:21 PM
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#15
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Get that VIN ? Group: Members Posts: 9,302 Joined: 1-May 03 From: Sunset Beach, CA Member No.: 643 Region Association: Southern California |
It would be nice if there was a test procedure to verify the relay is in good order. I previously wrote a test procedure for the L-Jet dual relay, but never got far with the intermittent relay.
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Bartlett 914 |
May 14 2024, 04:26 PM
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#16
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Advanced Member Group: Members Posts: 2,216 Joined: 30-August 05 From: South Elgin IL Member No.: 4,707 Region Association: Upper MidWest |
not the relay one of the screws that holds in the switches is loose and not making a ground 72 in South Jersey, so I took the Porsche out of hibernation and went for a drive. Over the winter I installed an intermittent wiper relay with the factory harness. As I am driving, the wipers kept turning on no matter what the position the switch was in. I stopped and pulled the relay and the wipers worked normal on hi & low and stayed off with the switch in the off position. How do I test this relay? I agree. Tighten the wiper switch mounting screws in the steering wheel. |
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