Lotus Elan

Electric window lifts

PostPost by: worzel » Wed Dec 24, 2008 11:03 am


Apologies for posting it here but it is Lotus related (and I never received a reply from the Excel owners forum).
Why does the window lift motor on my 89 Excel only operate for a few days at a time.? I've lost count of the number of times I've stripped the motor to find that where the brushes make contact with the brass/copper internals that a dark "ring" appears that apparently prevents current flow.

Cleaning off this ring with thinners immediately restores power- but only for a few days.

Substituting another known perfect motor produces the same problem so it's unlikely that the actual motor is the problem. If so any ideas on this one- I'm pretty sure the connector plug is not the problem. Is it possible that (in some mysterious way) the switch is the root cause and if so any ideas on what to look for. Incidentally it's not caused by water ingress- where the switches are water never reaches.

The window circuit doesn't have any "black boxes/mysterious electronic bits in it by the way.


Fourth Gear
Fourth Gear
Posts: 696
Joined: 13 Jan 2004

PostPost by: type36lotus » Tue Dec 30, 2008 12:47 am

Have both motors been rebuilt? Possibly with the incorrect type of brushes? Is the dark ring greasy? If so it could simply be grease burning up on the commutator.
Mike Geiger
66 S3 Coupe', no more :-(
User avatar
Fourth Gear
Fourth Gear
Posts: 577
Joined: 17 Sep 2003
Location: Tampa, Florida, USA

Total Online:

Users browsing this forum: checkrail, fatboyoz and 13 guests