| electric wiper problem [message #279608] |
Thu, 11 June 2015 09:58  |
midlf
Messages: 2212
Registered: July 2007
Location: SE Wisc. (Palmyra)
Karma: 1
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Senior Member |
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After it is raining my electric wipers will not turn off. In fact they speed up when turned off. After everything dries out they work fine. The speedup when turned off makes me think the park feature is not working.
Any ideas or should I just swap it out. BTW when I installed it a year ago I opened up the cover over the electronics and everything was clean, w/o corrosion and the contacts looked good.
Steve Southworth
1974 Glacier TZE064V100150 (for workin on)
1975 Transmode TZE365V100394 (parts & spares)
Palmyra WI
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| Re: [GMCnet] electric wiper problem [message #279613 is a reply to message #279608] |
Thu, 11 June 2015 10:36  |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Steve,
It sounds to me like you need to remove the motor, open the back, remove
the printed circuit board, and clean everything thoroughtly. If you do it
right after the problem arises, I suspect you'll find moisture inside.
Since the delay function is controlled by an RC time constant, with the
500k Ohm rheostat part of the R, that is a high impedance circuit. Even a
little moisture on the PC board can decrease R to where there is no delay
-- which is really an overide of the park circuit.
With everything dried out, when you reassemble the cover, put some sealant,
like silicone grease, around the flange to help keep moisture out.
It's very unlikely that it's anything else. You may want to consider
putting a waterproof "curtain" beneath the hood, as many have done, to keep
rainwater from falling on the MC, wiper, and anything else in the area.
Ken H.
Americus, GA
'76 X-Birchaven w/Cad500/Howell EFI & EBL,
Manny Brakes & 1-Ton, etc., etc.
www.gmcwipersetc.com
On Thu, Jun 11, 2015 at 10:58 AM, Steve Southworth
wrote:
> After it is raining my electric wipers will not turn off. In fact they
> speed up when turned off. After everything dries out they work fine. The
> speedup when turned off makes me think the park feature is not working.
>
> Any ideas or should I just swap it out. BTW when I installed it a year
> ago I opened up the cover over the electronics and everything was clean, w/o
> corrosion and the contacts looked good.
> --
> Steve Southworth
> 1974 Glacier TZE064V100150 (for workin on)
> 1975 Transmode TZE365V100394 (parts & spares)
> Palmyra WI
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: electric wiper problem [message #279636 is a reply to message #279608] |
Thu, 11 June 2015 13:30 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Senior Member |
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Ken,
What's the advisability of coating both sides of the PC board and its components with a conformal coating like the Onan circuit boards?
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: [GMCnet] electric wiper problem [message #279660 is a reply to message #279636] |
Thu, 11 June 2015 18:34 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Naturally, they're already coated, but not extremely well. However,
because the board plugs into the housing, and those contacts include the
high impedance delay circuit, the coating doesn't take care of everything.
I should have suggested, however, coating those contacts with silicone
dielectric grease also.
Ken H.
On Thu, Jun 11, 2015 at 2:30 PM, Johnny Bridges wrote:
> Ken,
> What's the advisability of coating both sides of the PC board and its
> components with a conformal coating like the Onan circuit boards?
>
> --johnny
>
> --
> '76 23' transmode Norris upfit
> Braselton, Ga.
>
> "Sometimes I wonder what tomorrow's gonna bring when I think about my
> dirty life and times" --Warren Zevon
> _______________________________________________
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> Unsubscribe or Change List Options:
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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