As mentioned in an earlier post the passenger side electric window in my Mondial was exceptionally slow, often grinding to a halt completely when trying to go up, or at best stopping 1 inch from the top. Clearly in a rain drenched country this is not the best behaviour to have for a car window, but Ferrari Mondials, 308/328s and 348s are renown for this problem.
After doing some searches on the internet I came across a site by UK Ferrari Owners’ Club member Frazer Smith. He is an electrician who has looked into this problem in detail on his 348 and believes the solution is poor wiring: thin wires that are excessively long, providing poor earthing, resulting in the window motor not being able to draw enough current. You can read more about it on his site www.ferrariwindow.com
I ordered up a pair of his booster boxes, they arrived quickly and I was excited to see the difference they would make, especially after seeing the dramatic video on his site, and hearing about the success another Mondial owner had when he installed them.
Stripping the Ferrari Mondial QV Door
Please note the text and photos applies to the Mondial QV 3.0L 1982-1985. I know that the door release catches (and probably door panels) are different on the Mondial QV 3.2L and later models, so you will have to work those out yourself.
I eagerly set about stripping the passenger side door, see the following photos below for an illustration of the steps involved, there are quite a lot of screws to remove, be careful not to mix them up as some are subtly different (eg there is one long silver one, the rest being short). A good policy for avoiding getting confused is to draw the door on an A4 piece of paper, then lay the screws down on the drawing in the place you removed them from.
The first panel to be removed is the long, thin middle one. After removing the retaining screw at the rear end of the door it should slide out towards the rear, ie pushing towards the rear of the car if the door was closed. This will reveal lots more thick silver screws. It should be fairly easy to remove these and take off the panels one by one, but leave the panel with the speaker grill until last. The two steps to watch out for are:
Door Catch Panel
You need to remove the door opening/locking catch chrome metal surround before removing this panel. There is a small silver screw underneath the door lock catch, it’s a little tricky to get to, and you may need thin nosed pliers to lift it out once it’s unscrewed. The the door surround should now slide out slightly upwards towards the front of the door, but be careful as it’s a tight fit and may be sticky, so take care not to apply so much pressure it shoots out, scratching the leather in the process. In fact try to slide it out slowly so you can note how the back of the door catch surround has small runners which slide under the door release catch lever mechanism, as when you re-assemble the door you need to get these back under the lever so it slides back in properly.
Speaker Panel
As you take this one off be careful as the speaker is attached to the inside of the panel with wires disappearing into the door frame, you don’t want to rip these off! I found I could lay this panel face down inside the car on a small box, meaning I could still work on the stripped down door without having to physically disconnect the speaker wiring, but ensure you put a blanket down or something so as not to scratch or scuff the leather on the panel.
Right, the door should look pretty bare now, and if you lift up the flaps of cloth you should see the mysterious system of wires and pulleys that lift up the glass for the window. The motor should be in the door frame, behind roughly where the speaker sits. You can happily test the window with the door like this (though it’s probably a good idea to keep turn your engine on to prevent draining the battery). I noticed that the window did actually go up all the way fairly well like this (despite a couple of slow downs) and, I’m guessing this is due to less frictional resistance which would normally be caused by the door panel that seals the bottom of the glass on the inside.
As shown on Frazer Smith’s web site I measured the voltage across the motor when raising the window. When moving smoothly it was 10v-11v but dropped to 7v when getting stuck or slowing down severely.
The first thing I did was to remove some of the old lubricant grease which had accumulated in big, crusty blobs at some of the pulley wheels. I then applied some WD40, re-lubed up the wires and pulley wheels with some fresh mechanical oil, and worked it in by zipping the window up and down 5 or 6 times. This did seem to make the whole mechanism a lot smoother.
Next up was to try Frazer’s electric window booster box. Following the instructions on his site was easy. I shortened the wires that fed into the motor first of all, as there seemed to be about 15cm (6-7in) of slack coiled up in the door frame. The box stuck to the inside of the door no problem with some double sided tape. I managed to undo a nut which was bolting the motor to the inside door frame using a 90 degree sprocket wrench and a lot of small movements, then securely fasten the earth wire onto this. I did have to re-stick the booster box in lower position though, as I’d not taken into account the position the glass would be when I lowered the window… it was guillotining the earth wire as it approached the bottom, oops!
So did the booster box make a difference… well one thing I was pleased about was the whole window mechanism was a lot better, it now only slowed down in the two positions that it ground to a halt to before. I can’t be sure whether this was due to the booster box letting the motor draw just enough current to get past the sticky points, or just the fact that I cleaned and re-greased the mechanism (and shortened the excessively long wires to the glass lifter motor), but one thing is for sure: I now had a window that closed! I didn’t see the dramatic improvement that can be seen in Frazer’s video of his 348, though I have spoken to him (he is a really nice guy) and there are still some things I can try, as he seemed to think I should get the dramatic speed increase, as in his video. It may well be that the earth connection from the door itself to the rest of the car is not very good, so if I improve this then the booster box may kick in better. When I get some spare time I’ll probably give it a go and post an update.