Author Topic: Wire Under Battery. What is it?  (Read 3361 times)

avanwinkle

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Wire Under Battery. What is it?
« on: February 10, 2019, 21:09:58 »
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, 21:25:12 by avanwinkle »

clunker

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Re: Wire Under Battery. What is it?
« Reply #1 on: February 11, 2019, 04:41:19 »
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, 16:08:15 »
It's a W113 1970.

Benz Dr.

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Re: Wire Under Battery. What is it?
« Reply #3 on: February 11, 2019, 17:24:43 »
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 ''
Dan Caron's SL Barn

1970  3.5 Coupe
1961  190SL
1985   300CD  Turbo Coupe
1981  300SD
2013  GMC  Sierra
1965  230SL
1967 250SL
1970 280SL
1988 560SEC

Pawel66

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Re: Wire Under Battery. What is it?
« Reply #4 on: February 11, 2019, 21:42:07 »
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 11, 2019, 23:46:14 »
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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Garry

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Re: Wire Under Battery. What is it?
« Reply #6 on: February 12, 2019, 02:23:12 »
Full Membership has its privileges.


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


Garry
Membership Administrator
Garry Marks
Melbourne/ Kyneton, Brisbane. Australia
1969 MB 280SL 5 speed RHD SOLD.
1965 MB 230SL Auto RHD Lt Blue 334G, Top 350H, Tourist Delivery.
1972 MB 280CE Auto RHD 906G
2005 MB A200
2006 MB B200
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mdsalemi

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Re: Wire Under Battery. What is it?
« Reply #7 on: February 12, 2019, 15:27:00 »
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
Davidson, North Carolina (Charlotte Area) USA
1969 280SL (USA-Spec)
Signal Red 568G w/Black Leather (Restored)
2023 Ford Maverick Lariat Hybrid "Area 51"
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Pawel66

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Re: Wire Under Battery. What is it?
« Reply #8 on: February 12, 2019, 17:05:01 »
Thank you!
Pawel

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