Lotus Elan

Wiper Motor Connections

PostPost by: "brassrngfm" » Tue Aug 10, 2004 1:58 am

Lotus Enthusiasts:
Well - after getting thoroughly soaked in a pop up thunderstorm on
the way home from a car show 2 weeks ago, I decided it's time to try
once again to get my wipers working - as my left arm only had limited
reach and effectiveness. Must have been funny for those passing me,
though!
As background, I'm a Chemical Engineer, but have built my own TV in
the distant past. Usually, things electrical don't scare me. But this
wiper has me perplexed. My DR3A (75446) has '1', '2', and 'E' spade
fittings - so I hooked up the ground from the battery to wiper
ground and tried attaching the hot leads to both 1 and 2. Nothing!
The wiring diagram shows 4 leads (1 of them being a hot wire) but I
only have 3 leads. I've taken my wiper/washer switch apart to clean
it and made a diagram of which of the three spade connections have
zero resistance at each detant of the 2-speed switch. I'd be happy to
have even 1 speed working (either slow or very slow), but am not sure
whether the motor is lunched or whether there is a bad setting on the
parking switch dome. (If I remember - I tok it apart to make sure it
was clean and not gummed up - but it's been a while.) Any advice on
where the hot lead goes -to switch or motor - or where I could find
the internal wiring diagram for the motor would be greatly
appreciated. Is there any site that tells the distinction between the
various DR3A models - as there must be hundreds of them.
Thanks
Paul Zimmerman
65S2
"brassrngfm"
 

PostPost by: JonHobden » Tue Aug 10, 2004 7:22 am

Paul wrote:
wiper has me perplexed. My DR3A (75446) has '1', '2', and 'E' spade
fittings - so I hooked up the ground from the battery to wiper
ground and tried attaching the hot leads to both 1 and 2. Nothing!

From my experiences playing with Prince of Darkness wiper motors on Minis
many years ago, you did the right thing, one or other (can't remember which)

of 1 or 2 is the switched feed, probably no 1 (motor should stay on when
live) and the other is the parking feed (motor will continue till the limit
switch cuts).

There's an internal schematic at http://www.ahsdc.org/2003/wiper.htm

The wiring diagram shows 4 leads (1 of them being a hot wire) but I
only have 3 leads. I've taken my wiper/washer switch apart to clean
it and made a diagram of which of the three spade connections have
zero resistance at each detant of the 2-speed switch. I'd be happy to
have even 1 speed working (either slow or very slow), but am not sure

Are you sure it's a 2 speed job? Even if you have a 2 sp switch, has some
PO substituted a single speed motor? 3 terminals gives you either 2 speed
or self park. If there is a bulge on the gearbox with a wire running to it
(or if it's one of the exotic ones an adjusting screw near the cable exit)
then it has self parking. There were some 2 speed electromagnet motors,
but I can't remember how many terminals (4 would make sense) but the modern
permanent magnet 2 speeders have a 5 terminal moulded connection, and they
rely on an earthing contact in the wiper switch for regenerative braking
when self-parking.

Hate to say this, but it sounds to me like you will have to take it apart.
If you can measure its current, if it's about 14A, then it's probably
seized, if nothing then there's a break or worn out brushes.

HTH

Jon
JonHobden
New-tral
 
Posts: 14
Joined: 05 Jul 2004

PostPost by: mackmotorsport at aol.com » Tue Aug 10, 2004 1:14 pm

One quick thing about the 3 terminal 1speed wiper motor-It should have 12v to
it with key on and the switch leg is switched to ground.I learned this by
frying one THEN looking at a wiring diagram
Bill Mack
mackmotorsport at aol.com
 

Total Online:

Users browsing this forum: No registered users and 15 guests