Is there a step by step Pertronix install

[center valley]

Received my Pertronix 1885 and coil for a a 1975 450SL and preparing to install. Is there a thread that will take you thru the install with elimination of switchgear? I have read bunches of threads about installs with problems and when I am done reading more confused then before I started. Also do I need another ballast resistor for install so the tach works properly if so what ohm rating?
Thanks for all help

[maynardg]

http://www.benzworld.org/forums/r-c1...975-450sl.html

Follow the posts by MBGraham within this thread. Works perfectly.

http://www.benzworld.org/forums/r-c1...onix-tach.html

8.2K resistor worked for me.

[MBGraham]

Not exactly step by step, but may suffice:

PeachParts Mercedes ShopForum - View Single Post - manual how to adjust the 3.5 engine (ignition and A/F ratio)

Someone over there asked about same thing for his 300SEL!

ADDED: Oops. I failed to notice OP had a 75 model. But Michncraig has that covered. Seems it is more difficult, but still do-able.

[michncraig]

Hi, I started the thread about the '75 install linked by Maynard above. Unfortunately it's not as clear as it could be because of the problems I had getting it sorted, but one important take away is that our 75 distributors are a little bit different than other years and the mounting needs to be modified a little bit to make it fit. There are pictures of what I did, and you can probably do better learning from my mistakes. Also, be sure to document the original wiring in case you need to revert back to points at any point in the future.

Good luck, and post back if you have any questions when you get into it, there are several folks on here who are running the pertronix set-up.





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[nathanso]

I'd slap one of these into my '75 in a heartbeat if I knew it would be a slam dunk.

[RadioTek]

Not exactly a slam dunk, but very nearly is the Crane/S&S conversion kit for a '75. At least it was for my case. The dizzy or the bracket didn't need to be modded. The hardest part was to fab up a mounting bracket for the electronics box to fit in the same holes as the original switchgear. It was a little more but not too much.
I think mine was $107.00 a few years ago. I considered it prophetic when I saw the price.:-)

Scott


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[The Proctologist]

add the flamethrower and shave the flange and it's a slam dunk, the actual work will take about ten minutes, the head scratching, forum reading and beer drinking takes about 2 hours

it's super simple and it improves performance noticably

[nathanso]

Is it correct that the Pertronix system replaces just the points and still uses the stock switchgear, whereas the Crane system replaces both the points and the switchgear? I'm all for replacing as many as the original ignition components as possible.

[maynardg]

Do both the Pertronix ignition and the Flamethrower coil and the switchgear comes out. Pertronix alone does not accomplish that.

[center valley]

I have the system almost complete except for one item. In the diagram shown on the pertronix install there is an extra wire that runs to the positive side of battery. Does this have to run direct to the battery. The reason I ask my battery is in the trunk.

Thanks