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#1 |
Registered User
Join Date: Nov 2013
Location: NY NY
Posts: 11
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Windshield wiper: 2 speed to intermittent
My 78 has the 2 speed wiper and works fine. Just wondering if the LMC intermittent wiper switch would be a plug n play or if there is more involved than that to make it work.
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1978 K10 Silverado 1967 Chevelle SS396 L78 2002 GMC 2500 CCLB Duramax |
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#2 |
Registered User
Join Date: Nov 2009
Location: Sherman, ME
Posts: 2,359
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Re: Windshield wiper: 2 speed to intermittent
You'll also need the intermittent wiper delay control module.
Since you have a '78, the conversion should be fairly straightforward. The motor & wiring stay the same. You simply unplug the connector from the existing wiper switch and plug it into the control module. The module then plugs into the delay wiper switch. See post #4 for a pic of the complete 78 - 83 wiper delay setup --> http://forum.73-87chevytrucks.com/sm...p?topic=9857.0 |
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#3 |
Registered User
Join Date: Nov 2013
Location: NY NY
Posts: 11
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Re: Windshield wiper: 2 speed to intermittent
Excellent. Thanks!
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1978 K10 Silverado 1967 Chevelle SS396 L78 2002 GMC 2500 CCLB Duramax |
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#4 |
Senior Member
![]() Join Date: Mar 2016
Location: Longview, TX
Posts: 758
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Re: Windshield wiper: 2 speed to intermittent
I know I'm digging up an old one here, but felt it made since to tag along to this one. I tried doing the retrofit with my '78 using a '78 intermittent switch and a new intermittent control module. All I get is a one speed wiper control. Any ideas?
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#5 |
Registered User
Join Date: Oct 2013
Location: Maine
Posts: 2,356
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Re: Windshield wiper: 2 speed to intermittent
I'm not positive but I think the wiper motor needs to be 79 and up. It's smaller looking than the older style.
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76 Chevy K20 76 GMC K15 77 Chevy C10 77 Chevy K10 |
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#6 |
Senior Member
![]() Join Date: Mar 2016
Location: Longview, TX
Posts: 758
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Re: Windshield wiper: 2 speed to intermittent
I think the cutoff is 78. 77 is the totally different setup.
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#7 |
Registered User
Join Date: Nov 2009
Location: Sherman, ME
Posts: 2,359
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Re: Windshield wiper: 2 speed to intermittent
Yes, 77 was the last year for the larger round body motor. 78-up should have the slightly smaller permanent magnet motor that should work with the 78-up switches & modules.
As for only having one speed working after swapping in the intermittent switch & module, I'd recommend double checking the connections. It's possible that one of the contact terminals in the connector got bent slightly when it was unplugged and now isn't making good contact with the new switch/module. I believe the intermittent function makes use of the low speed circuit so a bad connection there would prevent both of those from working while allowing high to still operate normally. |
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#8 |
Registered User
Join Date: Feb 2017
Location: Westfield, MA
Posts: 22
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Re: Windshield wiper: 2 speed to intermittent
I took the intermittent switch setup out of my 79 and installed into my 78 without any issues. The 78 motor is the same as the 79.
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-Peter 1978 K10 stepside |
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#9 |
Registered User
![]() Join Date: Jun 2017
Location: New Orleans
Posts: 386
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Re: Windshield wiper: 2 speed to intermittent
where the wipers the same from 78 to 91?
Is there anyway to retrofit a newer style blade to the arms? like the rain-x style that have no springs and are bent and give lots of pressure to the window? I want to daily my square, but really the wipers is what is concerning me. |
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#10 |
Registered User
Join Date: Nov 2009
Location: Sherman, ME
Posts: 2,359
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Re: Windshield wiper: 2 speed to intermittent
The wiper motors are the same from 78 to 87 (and up to 91 in the R/V series). They did change from a mechanical washer pump (mounted on the motor) to an electric washer pump (mounted on the fluid reservoir) sometime around 85 but the wiper motor itself didn't change.
The wiper arms & linkage changed in 81 due to the re-styled front sheetmetal. Yes, you can install the newer "mono-beam" style wiper blades on the stock arms. There are numerous different attachment styles (bayonet, J-hook, side-pin, etc.) used to connect the wiper blades to the arms. Just look for blades that have mounts that will fit your truck's wiper arms. Not all brands/styles of blades will be available with all mounting styles though so you might have to shop around a little. |
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#11 |
Registered User
![]() Join Date: Jun 2017
Location: New Orleans
Posts: 386
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Re: Windshield wiper: 2 speed to intermittent
great! Thanks for the info.
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#12 |
Account Suspended
Join Date: Jun 2011
Location: Des Moines, IA.
Posts: 4,143
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Re: Windshield wiper: 2 speed to intermittent
78-83 motors are all the same. 1984 went to stalk mounted wiper features and thus fender mounted washer pump inside the jug.
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#13 |
Registered User
Join Date: Mar 2012
Location: Woodbury, Ct.
Posts: 1,680
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Re: Windshield wiper: 2 speed to intermittent
My 84 has the control on the stalk with the mechanical pump above the motor...Which doesn't work by the way.
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#14 |
Registered User
![]() Join Date: Jun 2017
Location: New Orleans
Posts: 386
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Re: Windshield wiper: 2 speed to intermittent
how do I operate the manual pump on my '76 GMC?
noob question, I know. |
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#15 | |
Registered User
Join Date: Nov 2009
Location: Sherman, ME
Posts: 2,359
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Re: Windshield wiper: 2 speed to intermittent
Quote:
A momentary push of the button is all that is needed. If things are working correctly, that should engage the pump drive mechanism, the pump should deliver 3 or 4 squirts of the washer, and then automatically turn off (wiper motor will keep going until you switch it back off though). However, if the washer hasn't been used for quite a while it might take some time for it to pick up the fluid. And it might possibly need a new diaphragm if that's old & dried out (kits are available for them). |
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#16 | |
Registered User
![]() Join Date: Jun 2017
Location: New Orleans
Posts: 386
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Re: Windshield wiper: 2 speed to intermittent
Quote:
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#17 |
Registered User
![]() Join Date: Jun 2012
Location: Hill Country
Posts: 435
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Re: Windshield wiper: 2 speed to intermittent
will a 78/79 wiper motor direct fit in a 77? I want intermittent wipers myself.
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#18 |
Account Suspended
Join Date: Jun 2011
Location: Des Moines, IA.
Posts: 4,143
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Re: Windshield wiper: 2 speed to intermittent
You need to open up the metal wiper switch opening a little to fit the 78-83 style delay switch-the bezel will still over it trimming. You might find the delay modules in a junkyard-I have a couple NOS modules but they are not cheap.
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#19 |
Account Suspended
Join Date: Jun 2011
Location: Des Moines, IA.
Posts: 4,143
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Re: Windshield wiper: 2 speed to intermittent
You also need to swap the wiper linkage arm from the 73-77 style to the 78-83 one...they are different enough that you must swap them. I offer conversion wiper harnesses to go from 73-77 standard to 78-83 delay between the switch/fuse panel and also underhood.
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#20 |
Registered User
![]() Join Date: Jun 2012
Location: Hill Country
Posts: 435
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Re: Windshield wiper: 2 speed to intermittent
were 78-83 delays standard equipt? just making sure I am wrapping my head around this I need the wiper motor and the linkage from 80s and up to get delay?
gmachinz....I will still need the module correct? couple trucks local being parted out maybe I can score. |
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#21 |
Account Suspended
Join Date: Jun 2011
Location: Des Moines, IA.
Posts: 4,143
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Re: Windshield wiper: 2 speed to intermittent
The 78-83 trucks had the 2-speed wiper switch as standard-the pulse/delay was optional. I'm out of goodnused ones so I have only NOS modules left for now. On used modules I update to newer style Panasonic capacitors in place of thebold ones on thebcircuit board and then test each one.
If you have a 73-77 truck and wish to use the 78-83 style pulse wiper switch you will need: 78-83 wiper motor 78-83 wiper motor linkage arm and nut 78-83 wiper switch and module Underdash and underhood wire harness extensions. For wiring you can follow the basic diagram for the 78-83 trucks and adapt this to your truck-keep in mind 1978 was the first year for the mini fuse panel vs older glass type so the wiring changed colors also from 77 to 78-this is why I offer a control harness which is correctly color coded for the 78-83 setup since that is the desired upgrade anyway. I keep it all factory appearing. Here is a complete kit I have on hand (several are in storage at the moment) to give you an idea of a typical "kit" I've offered up before. But if you want to source some salvage yards/Ebay and parts stores you can also prolly gather up everything you need. |
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#22 | |
Registered User
![]() Join Date: Jun 2017
Location: New Orleans
Posts: 386
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Re: Windshield wiper: 2 speed to intermittent
Quote:
I wonder if it's possible to use a cadillac module or something similiar like detroit speed uses in their kits. |
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#23 |
Registered User
Join Date: Jun 2014
Location: CO
Posts: 738
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Re: Windshield wiper: 2 speed to intermittent
Since this is the place to ask about intermittent wipers, I have a question. I have 2 different modules and and 2 different switches. I tried both and neither worked that well. I just unplugged harness from old 2 speed switch and plugged in intermittent module in switch. So does the switch ground out through metal in gauge opening? I was kind of hoping they needed to be grounded and that is why the switches/module did not work. If it does not ground through opening then that means that switches/modules are bad right
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79 Chevy 2wd BIG10 350 TH400 |
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#24 | |
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Join Date: Jun 2004
Location: Spartanburg, SC
Posts: 1,963
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Re: Windshield wiper: 2 speed to intermittent
Quote:
Thanks Paul
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Paul '78 GMC Serria 15 Heavy Half. 361/NV3500/3.73. Former LWB NV3500 swap Trailing arm swap '98 ECSB Z71 daily driver -traded ![]() '03 burb. Family cruiser http://upstategmtrucks.com/ |
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#25 |
Senior Member
![]() Join Date: Mar 2016
Location: Longview, TX
Posts: 758
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Re: Windshield wiper: 2 speed to intermittent
As a note, I did figure mine out. It works perfectly fine. I was just expecting the variability on the high setting, not the low setting. I never even tried it.
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