Author Topic: Wire Under Battery. What is it?  (Read 449 times)

avanwinkle

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  • 1970 W113
Wire Under Battery. What is it?
« on: February 10, 2019, 22:09:58 »
I found this blue wire under battery that is not connected to anything on the tag end.  Need an Id for the wire and purpose if possible.  Thanks.[/img]
« Last Edit: February 10, 2019, 22:25:12 by avanwinkle »
Alex Van W.

clunker

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Re: Wire Under Battery. What is it?
« Reply #1 on: February 11, 2019, 05:41:19 »
Hi - what is the model/year/etc of this SL? The wiring loom varies across types.
Charles
1969 US 280SL 4-speed Red/Black
DB9 / 981 S / G300 SWB / CB750 / etc

avanwinkle

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Re: Wire Under Battery. What is it?
« Reply #2 on: February 11, 2019, 17:08:15 »
It's a W113 1970.
Alex Van W.

Benz Dr.

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Re: Wire Under Battery. What is it?
« Reply #3 on: February 11, 2019, 18:24:43 »
That's the wiring connections for the capacitive discharge box.
1966 230SL 5 speed, LSD, header pipes, 300SE distributor, ported, polished and balanced, AKA  ''The Red Rocket ''
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Pawel66

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Re: Wire Under Battery. What is it?
« Reply #4 on: February 11, 2019, 22:42:07 »
Could you kindly put that in English?
Pawel

280SL 1970 automatic 180G Silver
W128 220SE
W121 190SL
G-class

MikeSimon

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Re: Wire Under Battery. What is it?
« Reply #5 on: February 12, 2019, 00:46:14 »
My Owner's Manual has a wiring diagram, which, I must say, is one of the most useless ones I have ever seen as it has no wire color indications.
Anyway, here it is. maybe it is the ground connection from the distributor - item 47.
1970/71 280SL Automatic
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German specs
3rd owner

Garry

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Re: Wire Under Battery. What is it?
« Reply #6 on: February 12, 2019, 03:23:12 »
Full Membership has its privileges.


There is a colour wire diagram in the restricted area of the Technical  Manual accessible by Full Members.


Garry
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Garry Marks
Melbourne/ Kyneton, Australia
1965 MB 230SL Auto RHD Lt Blue 334G, Top 350H, 213 Leather, Tourist Delivery
1964 VW Kombi Split Screen (Muffin Top) Single Cab Utility Blue 334G lower, top 350H. Restored
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mdsalemi

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Re: Wire Under Battery. What is it?
« Reply #7 on: February 12, 2019, 16:27:00 »
Could you kindly put that in English?

I believe the 1970-1971 models featured a rather early design of a CD electronic ignition, by Bosch. CD=Capacitive Discharge.

https://en.wikipedia.org/wiki/Capacitor_discharge_ignition

Anyway, these featured a box that housed the electronics and this box was mounted underneath the battery, hence the wiring that Dan Caron Dr. Benz is referring to. Like all electronics, they don't last forever, and if they go bad they simply aren't worth replacing (good luck finding one and how old is that?) or repairing; you just change to the electronic ignition of your choice--Pertronix, Crane or a 123.

The Crane, by the way, also features a box, and it itself is a derivative of an older Lucas system I'm told. Anyway when I had my Crane, it too was mounted under the battery for a tidy look--invisible.
Michael Salemi
Novi, (Detroit Area) Michigan USA
1969 280SL (USA-Spec)
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Pawel66

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Re: Wire Under Battery. What is it?
« Reply #8 on: February 12, 2019, 18:05:01 »
Thank you!
Pawel

280SL 1970 automatic 180G Silver
W128 220SE
W121 190SL
G-class