Ferrari Mailing List: Re: window motor 1981 308

[David Thursby (david]

Unlikely that a new motor will fix it - unless it doesn't work at all.

The problem is two-fold.

1. The mechanism is full of grease that over time, sets like epoxy 
resin. Clean that gunk out and regrease with lithium grease and the 
motor will have a lot less work to do.

2. The wiring for these things is crazy. The motor has +12 coming direct 
from the fuse box. The ground is switched by the console switches to one 
of 2 poles in the motor - one for up, other for down. If you use the +12 
and the switching ground to trigger a set of relays installed in the 
door, you can use a local ground in the door itself as the ground for 
the motor circuit, rather than running through multiple connections and 
old cruddy switches. There are commercially available "Window 
Accelerators" that house this all in a neat little box. It is fairly 
straightforward if you want to do it yourself though. There's plenty on 
ferrarichat including circuit diagram and connection instructions.

You can check the voltage at the motor when power is applied to it. 
You'll be lucky to see 8 volts - maybe less. Don't make the mistake of 
checking the +12 against the door chassis - it's always a nice healthy 
+12 or so and can hide the real problem. Measure at the motor terminals...

Everything I have described is DIY, but it can be fiddly. That mechanism 
has a cable that does the work - that thing can get awful tangled if you 
don't pay attention :) I know this from personal experience! It's also 
pretty tight working in the door cavity, so wear some thin leather 
gardening gloves as the edges are pretty sharp. Take your time - it'll 
work out well.

Dave

Michel Savard wrote:
> Ferrari 1981 308 GTSi. I think it's time to change the window motor on
> the driver's side. I cleaned the switch twice and now nothing moves. No
> rush I got all winter to do it.
> Rutlands from Georgia  has one (OEM)  for $120.00 
> I was wondering if I could buy a cheaper one (non-OEM) ? Any ideas ?
> Before I ask my mechanic to do it, is it hard to change ? 
>  
> Thank you!
>  
> Michel Savard
>  
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