Re: Power Window Modern Conversion
Posted by Craig Hendrickson On 2014/6/10 15:03:26
(continued from 1st post)
The first challenge results from bench testing the Autoloc regulator (they call it a "track" with "lift") and their Bosch motor to see how the wiring and motion compares to the Packard regulator and motor. Aarg! They are NOT the same! The Packard motor wiring uses the regulator and door as electrical ground. If one touches either of the two motor wires with a hot lead (12V POS in my case since I converted my Pat to negative ground right after I bought it), the regulator arm moves in one direction. If you touch the other motor wire with the same hot lead, the regulator arm moves in the other direction. BTW, this explains why the power windows are NOT affected by changing from POS to NEG ground.
The Autoloc (Bosch) motor also has 2 wires, but when tested the same way as the Packard (above), NOTHING HAPPENS. However, if you connect one wire to POS and the other wire to NEG, the regulator lift moves in one direction. If you reverse the connection, the regulator lift moves in the other direction. This is a problem because the Packard 4-switch only supplies the "hot" side (POS in my case) to either wire and does NOT change polarity.
There are several solutions to this polarity-reversal problem. Autoloc (and others) sells switches that are DPDT with the contacts reverse wired, but these switches do not fit the Packard 4-switch and don't the look the same anyway. I wanted to retain the original 4-switch on the driver's door, so I devised a dual relay wiring solution. Here's one of the Omron "LY1" terminal connection diagram:
I used these Omron "LY1" cube relays and brackets because I had 4 new ones left over from another project, which is exactly how many I needed for both front doors. Any other equivalent relay would work as well. Here's the relay wiring schematic:
I used dual relays to avoid a momentary short problem when using just one relay. By using the 2nd relay to supply voltage to the "powered" relay terminals, I utilized the slight delay inherent in the relay coil and contacts closing to avoid the momentatry short. Here are the dual relays wired as above:
(continued next post)
The first challenge results from bench testing the Autoloc regulator (they call it a "track" with "lift") and their Bosch motor to see how the wiring and motion compares to the Packard regulator and motor. Aarg! They are NOT the same! The Packard motor wiring uses the regulator and door as electrical ground. If one touches either of the two motor wires with a hot lead (12V POS in my case since I converted my Pat to negative ground right after I bought it), the regulator arm moves in one direction. If you touch the other motor wire with the same hot lead, the regulator arm moves in the other direction. BTW, this explains why the power windows are NOT affected by changing from POS to NEG ground.
The Autoloc (Bosch) motor also has 2 wires, but when tested the same way as the Packard (above), NOTHING HAPPENS. However, if you connect one wire to POS and the other wire to NEG, the regulator lift moves in one direction. If you reverse the connection, the regulator lift moves in the other direction. This is a problem because the Packard 4-switch only supplies the "hot" side (POS in my case) to either wire and does NOT change polarity.
There are several solutions to this polarity-reversal problem. Autoloc (and others) sells switches that are DPDT with the contacts reverse wired, but these switches do not fit the Packard 4-switch and don't the look the same anyway. I wanted to retain the original 4-switch on the driver's door, so I devised a dual relay wiring solution. Here's one of the Omron "LY1" terminal connection diagram:
I used these Omron "LY1" cube relays and brackets because I had 4 new ones left over from another project, which is exactly how many I needed for both front doors. Any other equivalent relay would work as well. Here's the relay wiring schematic:
I used dual relays to avoid a momentary short problem when using just one relay. By using the 2nd relay to supply voltage to the "powered" relay terminals, I utilized the slight delay inherent in the relay coil and contacts closing to avoid the momentatry short. Here are the dual relays wired as above:
(continued next post)
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