Petronix II instalation question. 4.5 - Page 2 - Mercedes-Benz Forum

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post #11 of 23 (permalink) Old 12-28-2015, 08:04 AM
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Originally Posted by wroding View Post
Hi Mb Graham.
I must admit that wiring gets me confused very quickly I recently changed out my spark plug wires for these.

Bosch 09027 Spark Plug Wire Set

Am I ok with this setup? Or should I change to the 1885?
Thanks John.
Those are the wires I have used successfully on my car along with the 1885 Pertronix for years. I have retained the MB switchgear wired in way shown in earlier post link.

The original (OE) wires had resistors at each end - 5kohms at plug end and 1kohm at distributor end (if memory serves me). The 09027 Bosch wires are I believe 1kohm. Assume the resistor is at plug end. For the 91885, Pertronix seemed to be concerned about lack of resistance in the wire from plug boot back to distributor. And because Bosch wires have copper core this is essentially zero. (Would have to cut wire apart to prove this! )

I have some trouble with idea of putting in carbon core resistance wires which to some extent could defeat (or require) need for a higher voltage coil like the Flamethrower. But if it works for some, perhaps that is one option.

Seems a couple of guy have gone the route of carbon core wires with the 91885 while many have used the 1885 with 1kohm Bosch (or other similar) aftermarket wires. Your choice, I guess. Good Luck!

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post #12 of 23 (permalink) Old 12-28-2015, 01:34 PM Thread Starter
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I really don't want to change out the wires again. Should I just return the 91885 petronix unit and go with the 1885? All I'm trying to do is improve on the points setup because setting them is a royal pain. I want to try and make this switch as simple as possible.
Thanks John.
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post #13 of 23 (permalink) Old 12-28-2015, 01:48 PM Thread Starter
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I just went ahead and ordered the 1885 unit. I will send the other back when it gets here. While we are on the subject I wanted to put the crane unit (xr700) I believe in my 6 cylinder 280se. I saw that the bloke on Mercedessource recommends it highly. It comes in at around $130 with extra install instructions from him. Any experience with this unit?
Thanks guys for all the help.
Cheers John.
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post #14 of 23 (permalink) Old 12-28-2015, 02:46 PM
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I just went ahead and ordered the 1885 unit. I will send the other back when it gets here. While we are on the subject I wanted to put the crane unit (xr700) I believe in my 6 cylinder 280se. I saw that the bloke on Mercedessource recommends it highly. It comes in at around $130 with extra install instructions from him. Any experience with this unit?
Thanks guys for all the help.
Cheers John.
Probably the safest route. Only thing to be aware of with 1885, is not to leave ignition key on for very long without engine running. It's not something we do very much, unless trouble shooting so should not be a problem. If you do need to leave key on, disconnect the Pertronix red wire.

Seeing you were only concerned about the green wire, there is no need to bypass the ignition module (aka Switchgear). The 1885 will just replace the points. If you want to bypass switchgear later and add a Flamethrower coil, then that can be done with a small wiring change.

For the simple points replacement, the red and black wires do not go to the coil. The diagrams in this link are for an early djet but principle is same for all. Be sure to run a ground wire from the body of the distributor. It can go to the battery negative or perhaps to a chassis ground located just below the coil.


If you decide to bypass the switchgear and change the coil, use the diagram that shows the switchgear bypassed.

Regarding Crane for your 6cyl 280SE. I have no first hand experience, but it does seem popular for some cars. Especially those where Pertronix doesn't fit the distributor properly. But another Pertronix may be the way to go rather than learn about two systems? Looks like they have two options depending on year of car.
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post #15 of 23 (permalink) Old 12-28-2015, 03:50 PM
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John I have the Crane XR700 on my 4.5 . Works great even with the original Bosch coil.
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post #16 of 23 (permalink) Old 12-28-2015, 03:55 PM
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I think you are in good hands here. Lots of guys on the 107 forum use pertronix and swear by it. I've never done a conversion myself, but MBGraham is the "go to guy". Thanks MBGraham!
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post #17 of 23 (permalink) Old 12-28-2015, 05:01 PM Thread Starter
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Thanks Guys for all your help. I expect it here on Wednesday, so if I have any questions I will be back.
Just to clarify.. Using the 1885 petronix. The red wire goes to the Blue ballast resistor as shown in your Picture MB Graham and The black goes to where the original green wire went? I will also add a ground wire from distributor to a good ground.
Thanks John.
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post #18 of 23 (permalink) Old 12-28-2015, 05:15 PM
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Thanks Guys for all your help. I expect it here on Wednesday, so if I have any questions I will be back.
Just to clarify.. Using the 1885 petronix. The red wire goes to the Blue ballast resistor as shown in your Picture MB Graham and The black goes to where the original green wire went? I will also add a ground wire from distributor to a good ground.
If your car's connections looks like mine, then yes, that is how the Pert is connected when retaining the switchgear. Some of the later Djets have slightly different wire routing and switchgear, but in principle, would be wired the same way. I presume you were referring to this picture:

1972 350SL 4.5L - MBGraham, near Kingston, Ontario
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post #19 of 23 (permalink) Old 12-28-2015, 11:11 PM Thread Starter
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If your car's connections looks like mine, then yes, that is how the Pert is connected when retaining the switchgear. Some of the later Djets have slightly different wire routing and switchgear, but in principle, would be wired the same way. I presume you were referring to this picture:

Yes.. I have a blue resistor just like yours. The other two terminal connection is in a different location, just off to the side of the oil cooler. It is the one the green wire from the condenser in the distributor connected to.
I will post some pix tomorrow.
Thanks again for taking the time.
Cheers John.
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post #20 of 23 (permalink) Old 01-05-2016, 11:51 AM
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Alex. Purchased my car about 6 years ago. She was gold with tobacco but had been in a barn for 12 years following an engine fire. Good bit of rust. I did all the mechanical and welding of new sheetmetal up through primer. had a young guy starting a body shop paint it for me. Did interior myself.
Sorry, off topic, but answering your post above.

Did you do these door handles by choice or do you need some brown ones ?

Looks terrific.
I wish I would get that far with ANY of my cars....

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