[Tigers] Wiper Motor Follow-Up

[Tom Parker]

>From my old issue of C.A.T. Shop Notes (if you don't have it, recommend you
get a copy; it's just been updated...)  "First, the switch on the dashboard
is installed upside down. That is, connector lug 1 is at the bottom, where
for all the other switches it is at the top. Second, the element of control
is the ground... the green wire to the motor is hot any time the key is on.
The dashboard switch completes the wiper circuit by taking it to ground"
(the motor is insulated from the frame; the ground is completed by the
wiring...T)

"Finally, and most perverse, one of those leads,  RG powers the High Speed
circuit; only when you connect it with the other lead, NLG, do you get Low
Speed.(if you power NLG alone, with suitable grounding, it merely hums.) To
get Low Speed, both NLG and RG must receive power along with a suitable
ground.

To make this installation, position the switch connector 1 down (upside
down) and the bat handle up, then wire it as follows: Ground lug 6 to the
side of the Tach, B; connect NLG to 4, and put RG on 1.."

There's more; this is the gist of it.  Try it with the wiper blades off the
lugs. The wiring diagram doesn't show the upside down switch, C.A.T.'s
Tiger Under-Dash Wiring illustration does.

Key point: the motor is wired thusly to allow the wipers to move to rest
regardless of when you turn the switch off. So there may be a problem with
the internal "at rest" switch, or the dash switch may be upside down... or
there may be another bug.. (or 2... and I need to revisit my motor / wiring
on my Kitty; it doesn't have the "gusto" I'd like to see... Good Hunting!)

Tom
'67 Mark 2

Mis-spellings and bad punctuation are because I don't type well...

T


On Sun, Apr 20, 2014 at 4:02 PM, Graham Harlowe <gharlowe at comcast.net>wrote:

> Listers -
>
> Thanks for the advice on replacing the wiper motor.  I was able clean the
> contacts and grease the cable on the used replacement assembly and install
> as a unit, keeping the two wheel boxes in place.  I did find it easier to
> remove the passenger seat and loosen the dash fasteners to provide some
> clearance from the glove box.
>
> Unfortunately, replacing the wiper motor didn't fix the 'no wipers'
> problem.
> I swapped the wiper switch with the blower switch to eliminate that
> variable
> (blower still worked, wiper motor didn't).  From the circuit diagram, it
> looks like the double green connector gets constant (ignition switched)
> power, and the wiper switch completes another circuit, allowing either of
> the other two connectors to receive power.   I confirmed that the double
> green connection at the wiper motor is getting switched power.  It's
> possible that both wiper motors are bad, but that seems unlikely.  Any
> recommendations to bench test my original motor as long as it's out of the
> car, or do some simple checks on the replacement now that it's installed?
>
> Thanks as always,
>
> Graham Harlowe
> B382001466
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