Author Topic: EPC help with ground cable  (Read 219 times)

daantjie

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EPC help with ground cable
« on: 29 October 2020, 07:22 PM »
Hi guys

Looking for a part # on my 6.9, I have scoured the EPC but am stumped  :o

Looking for the ground cable which runs from the engine to the negative battery terminal.  It connects approximately at the alternator area.

Mine is a bit worse for wear but I cannot see this on the schematic?

Cheers
Daniel
1977 450 SEL 6.9 - Astralsilber

Max-NL

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Re: EPC help with ground cable
« Reply #1 on: 29 October 2020, 07:43 PM »
Don't you mean the positive cable? Negative cable goes from the terminal to the chassis.
1971 R107 350 SL (Dad's)
1975 W116 280 S (Dad's)
1975 W116 450 SEL 6.9 #140 (Dad's)
1977 W123 230 (Mine)
1992 W124 230 CE (Mine)

daantjie

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Re: EPC help with ground cable
« Reply #2 on: 29 October 2020, 08:29 PM »
Don't you mean the positive cable? Negative cable goes from the terminal to the chassis.

Thanks but on my 6.9 in addition to the negative terminal to chassis connection, there is also another cable which connects to the clamp on the negative terminal and runs to the motor and bolts onto the alternator mounting bracket.
Daniel
1977 450 SEL 6.9 - Astralsilber

ptashek

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Re: EPC help with ground cable
« Reply #3 on: 30 October 2020, 04:35 AM »
This? A1001500032 (group 15, section 001 "Electrical Equipment", first drawing, part #74, "Ground Cable")
1993 "Pearl Blue" W124 280TE
1988 "Arctic White" W124 200T
1979 "Icon Gold" W116 450SE (history, resto)

daantjie

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Re: EPC help with ground cable
« Reply #4 on: 30 October 2020, 07:21 AM »
Thanks yes I looked at this one before but I think it might be the strap between the bellhousing and the chassis ???
Daniel
1977 450 SEL 6.9 - Astralsilber

daantjie

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Re: EPC help with ground cable
« Reply #5 on: 01 November 2020, 01:37 PM »
I pulled the wire and it seems to me like it's a "home brew" type cable to be honest.  It has a stamping on the insulation:"#6 SAE COPPER".  Any auto - electrical guru's care to chime in?  The crimping on the eyelets are very badly done so I highly doubt this is an OE setup ???
Daniel
1977 450 SEL 6.9 - Astralsilber

Max-NL

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Re: EPC help with ground cable
« Reply #6 on: 01 November 2020, 02:16 PM »
Can't remember if if I have ever seen a stamping/mark on the wiring on any of the Mercs.
1971 R107 350 SL (Dad's)
1975 W116 280 S (Dad's)
1975 W116 450 SEL 6.9 #140 (Dad's)
1977 W123 230 (Mine)
1992 W124 230 CE (Mine)

daantjie

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Re: EPC help with ground cable
« Reply #7 on: 01 November 2020, 02:31 PM »
Thanks yes I think this must have been done under the previous owner's hands, I think I'll remove it and see what happens, it really does not look factory spec to me.
« Last Edit: 01 November 2020, 03:44 PM by daantjie »
Daniel
1977 450 SEL 6.9 - Astralsilber

John H

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Re: EPC help with ground cable
« Reply #8 on: 02 November 2020, 01:02 AM »
An auto electrician friend told me that often a tired alternator will work better if you add a dedicated earth cable to it. I don't know the science behind it, but it does work in my experience. Sounds like someone has done this with your car.

daantjie

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Re: EPC help with ground cable
« Reply #9 on: 02 November 2020, 07:39 AM »
An auto electrician friend told me that often a tired alternator will work better if you add a dedicated earth cable to it. I don't know the science behind it, but it does work in my experience. Sounds like someone has done this with your car.

Thanks makes sense.
Daniel
1977 450 SEL 6.9 - Astralsilber