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    1. · Registered
      1973 450SL w/ 65,000 miles
      Joined
      ·
      53 Posts
      I wanted to report another successful switchgear bypass following instructions in this thread using same wiring as post #32 (first two pics in post #1 no longer seem available). Did Petronix 1885 igniter install a couple of years ago then about six months ago switchgear got wet during wash, took several days to dry out before I got spark again, over subsequent months car stranded me a couple of times that I’m convinced was caused by failing switchgear.

      Few notes from install:

      Eyelet on 12v red/black wire was too small for positive terminal on flamethrower coil, so had to add larger eyelet.

      With no resistor in wiring from coil negative to tachometer, tach showed cold start idle around 2200rpms, where 700-800 was my normal pre-conversion.

      I installed this 10k ohm 1/2 watt resistor bought off Amazon 10K Ohm 1/2W Flameproof Resistor 10 Pcs.: Single Resistors: Amazon.com: Industrial & Scientific

      Wired in the resistor using method shown in YouTube video linked at post #33 (no soldering just crimp-on butt connectors).

      With resistor installed cold start idle rpm shown on tach returned to what appears to me to be back to normal range. If I ever get a handheld tach, I’ll report back findings.

      Used the wirecare.com silicone coated fiberglass sleeve to cover wire new wire with resistor. Been very happy with that product.

      Lastly, in working through ignition issue I’ve been very happy with this spark tester, which works with Bremi spark plug connectors my car uses and was well worth its $10 cost to me https://www.amazon.com/gp/product/B06X9RC3PF/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
       
    2. · Registered
      Joined
      ·
      57 Posts
      I wanted to report another successful switchgear bypass following instructions in this thread using same wiring as post #32 (first two pics in post #1 no longer seem available). Did Petronix 1885 igniter install a couple of years ago then about six months ago switchgear got wet during wash, took several days to dry out before I got spark again, over subsequent months car stranded me a couple of times that I’m convinced was caused by failing switchgear.

      Few notes from install:

      Eyelet on 12v red/black wire was too small for positive terminal on flamethrower coil, so had to add larger eyelet.

      With no resistor in wiring from coil negative to tachometer, tach showed cold start idle around 2200rpms, where 700-800 was my normal pre-conversion.

      I installed this 10k ohm 1/2 watt resistor bought off Amazon 10K Ohm 1/2W Flameproof Resistor 10 Pcs.: Single Resistors: Amazon.com: Industrial & Scientific

      Wired in the resistor using method shown in YouTube video linked at post #33 (no soldering just crimp-on butt connectors).

      With resistor installed cold start idle rpm shown on tach returned to what appears to me to be back to normal range. If I ever get a handheld tach, I’ll report back findings.

      Used the wirecare.com silicone coated fiberglass sleeve to cover wire new wire with resistor. Been very happy with that product.

      Lastly, in working through ignition issue I’ve been very happy with this spark tester, which works with Bremi spark plug connectors my car uses and was well worth its $10 cost to me https://www.amazon.com/gp/product/B06X9RC3PF/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
      Hi,
      I have a issue with my conversion. After add the pertronix, my tach wont read anything. I tried numerous resistor, some will even make the needle go backwards, but nothing close to right..
       

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