The trouble with Alfa Romeos of that era, and it looks like Ferraris too, is the cable operated electric windows. The cables bind up on the various pulleys and cannot slide across them properly, especially if the pulleys are seized and won't turn when the electric motor tries to wind the window cables up and down. Those cables look so tight that one can pluck them like guitar strings. As you discovered, that car has a substantial voltage drop/current loss in the window switch and wiring connections between the switch and the door's window motor. Wiring in 2 relays is the only method to solve the problem, as you did.

I HATE those Italian windows run by cables. Normally a scissor system is much less likely to fail. And a broken cable is terrible to replace. I happened to me in Italy in my Fiat during an extremely strong thunder storm . The window dropped to the bottom and the car got full of water in record time. I did not have tape on me and had to drive south 500 miles more. I despereately tried to pull the glass up and tried to jam the window with a screwdriver. I was shocked two years ago then the same nonsense happened on my old BMW. I did not even know that this car had the same stupid system. At least I had strong tape to close the window. The tape had to be replaced every few days. I sold this old junker for a few hundred $. That solved this problem for me. Very interesting video and how you show the fix to the much to common ground and wiring problem of classic Italian vehicles.

A very elegant solution. Maserati Biturbo with slow windows and a cable that is pulled/pushed through a circular channel, for lack of a better way to describe it. But a contributing factor is reduced voltage getting to the motor, that you've solved!

This is a wonderful model! All those carbs!

Tom, very nice fix!

Love the ‘tennis ball trick’ great video as always!

Hello Tom, it‘s funny you just treated the subject of slow windows. The same issue cropped up on my 1987 Testarossa, but my driver side window took over a minute to retract. There is a guy in England who sells special relay kits to solve the problem. I will see if I can find his contact. My mechanic is just installing the relay kit for me now. I will contact him tomorrow to see the results.

Great video. I fear that the slow windows on my '87 Mondial are due to hardened grease on the pulley mechanism, and that the only way to fix it properly is to disassemble the entire Rube Golberg device that is the Ferrari window mechanism, clean and regrease it -- and put it together again with the proper tension. Moreover, I don't have the huge cutouts in the door panel that you have in the 365. But I'm definitely going to look into the ingenious relay set up that worked so well here.

Have you considered using marine grade relays in the doors because of the water intrusion/exposure problem?

I see that the glove compartment is removed. Is this the proper way to access the connections to the relay board on the firewall?? What's the best way to remove the fuse holders and glove box??