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1001miker

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About 1001miker

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Profile Fields

  • Porsche Club
    PCA (Porsche Club of America)
  • Present cars
    '97 993 Cabriolet
  • Former cars
    '87 Carrera Cabriolet, '67 912 Coupe
    '70 912
  1. Hi all, I had a similar problem with the top on my '97 993 cab. I found that diagnosing the problem (it was intermittent) was almost impossible because of the complexity and location of all the various sensors and controls. I wound up throwing away most of the original wiring and the control box. I built my own control box out of a series of relays (purchased on eBay for less than $20) and installed my own wiring. It took a while to figure out all of the correct control sequences and relay polarities, but once done, it has worked flawlessly for approx 2 years now. I live in southern California and use the top up and down all the time. I believe it took 12 standard 30 amp relays to build, plus the wiring. The hardest part was routing the wiring in an inconspicuous manner, and mounting the relays under the passenger seat where space is very limited (in my case, because I also have a large after market amplifier mounted there). I also had to design a time delay into one of the relays (relatively simple for anyone that would attempt a job like this). I bypassed the safety on the handbrake lever (I can actually lower or raise the top while moving [SLOWLY!!!]) and the little dash light that tells you whether you have completely raised or lowered the top (not really necessary if you have set the top up and top down limit switches properly). In actuality, the top mechanism is fairly simple. It contains only one (or sometimes two) raising and lowering motors, two limit switches in the rear (to set fully open and fully closed positions), two latch motors ( in the front rail of the top) with built in limit switches to prevent motor overrun, and two limit switches, again in the front rail of the top to tell the latch motors when they can operate. The time delay relay is necessary to bypass the internal limit switches of the latch motors to get them to start in the opposite direction after they have been used to either lock or unlock the front rail of the top. If anyone is interested, I can provide a schematic of what I did. I can assume no responsibility for any one else's mistakes in trying to use this. It works very well for me. Sincerely 1001miker :drive: :eek: :cheers: :renntech:
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