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Author Topic: wipers work but pulse doesn't  (Read 3358 times)

Offline mdethlefs

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wipers work but pulse doesn't
« on: May 29, 2018, 03:52:16 pm »
I have an 77 C10 with an 85 cab and all of the 85 electrics (P/W,locks, ect.)the wipers work but the pulse/delay does not. I replaced the switch in the column and the pulse board (AC DELCO part) any ideas? I'm going to print off the schematics and check the wiring but I assume if the wipers work in the low and high setting they'd be okay???
When I did this swap the schematics on this site helped tremendously.
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Mike 1977C10 Scottsdale 350HD, 1982C10 Custom Deluxe 355

Offline VileZambonie

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Re: wipers work but pulse doesn't
« Reply #1 on: May 29, 2018, 08:16:30 pm »
If everything works normal it's probably a bad module. Clean and recheck the connections.
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74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline mdethlefs

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Re: wipers work but pulse doesn't
« Reply #2 on: June 07, 2018, 03:51:50 pm »
i did that and even tried another module.
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Mike 1977C10 Scottsdale 350HD, 1982C10 Custom Deluxe 355

Offline bd

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Re: wipers work but pulse doesn't
« Reply #3 on: June 07, 2018, 05:04:12 pm »
Review the factory diagnostic procedure in the 1984 Service Manual.
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Rich
It's difficult to know just how much you don't know until you know it.
In other words... if people learn by making mistakes, by now I should know just about everything!!!
87 R10 Silverado Fleetside 355 MPFI 700R4 3.42 Locker (aka Rusty, aka Mater)

Offline VileZambonie

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Re: wipers work but pulse doesn't
« Reply #4 on: June 07, 2018, 05:07:05 pm »
If it's a tested and known good module, low and hi work normal then recheck the switch
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,                           ___ 
                         /  _ _ _\_
              ⌠ŻŻŻŻŻ'   [☼===☼]
              `()_);-;()_)--o--)_)

74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10
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