Lower wiring harness & crackling wire insulation - Mercedes-Benz Forum
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post #1 of 12 (permalink) Old 06-13-2009, 10:45 AM Thread Starter
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Lower wiring harness & crackling wire insulation

I replaced the main wiring harness in my '95 E320 a few years ago, and I've been thinking about replacing what is supposedly called the lower wiring harness--includes the wires that are routed very near the oil filter housing inside the engine compartment. I have done my best to keep these wires wrapped and protected, but I just changed my oil and thought that it might be the time to replace this lower wiring harness. My questions:

1. Does anyone know the part number for this lower wiring harness?

2. What, exactly is connected to this lower wiring harness? One end is connected to the (-) terminal of the battery...

3. I'm not noticing any electrical problems at the moment, so should I just skip it?

4. How easy is it to replace the lower wiring harness?

I'd appreciate any advice/help/experience
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post #2 of 12 (permalink) Old 06-13-2009, 11:01 AM
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I am curious also as I am exactly in your shoes. When I priced my main one a few years ago the lower was like 400 dollars but didnt ask for any other info. I got the pricing from buy mb parts.
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post #3 of 12 (permalink) Old 06-13-2009, 08:13 PM
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Hi guys. I have the same problem with my lower wiring harness. The wires behind and to the right of the oil filter are cracking pretty badly. After Ii found out the price of the harness I decided I would be very careful when changing the oil filter. There are no issues right now so I'll wait on the replacement. Hope this info helps.

124-440-49-05 $889.00 delivered

Thank you
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post #4 of 12 (permalink) Old 06-13-2009, 08:37 PM Thread Starter
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Wiring Harness Prices?

Hi--

I don't think that this is the correct wiring harness. The price should be somewhere more than $100 and less than $400. There are only a handful of wires that are a part of this wiring harness, so I think that if the price is, indeed, over $800, I will be replacing the wires one by one or I'll hand wrap each in brown electrical tape, since most of them are brown with a colored stripe. Is anyone interested in going in on purchasing bulk wiring with me? I wonder if the original color codes are available? With the price I've paid for wiring already, I feel that all of the wires should be red (for anger), green (for total dollars spent), or gold (what, for the prices charged, they should be made out of).

Maybe, here's the best plan (and I am not serious in suggesting it, in case anyone wants to investigate me and my MasterCharge bills for repairs on this car):

1.)
Sign up for the US Fidelis extended warranty (they are annoying and will call you relentlessly telling you that your ancient car is about to explode at any minute, so I don't advocate any communication with them).

2.)
Drive the car hard for miles and miles without changing the oil so that you don't further damage the wiring.

3.)
Purchase oil and filters every 5000 miles (but don't change the oil or filter--give them away as gifts--and keep the receipts).

4.)
When the engine finally seizes (after the 6-month grace period with US Fidelis) you'll be able (at least according to their NASCAR celebrity-endorsed commercials) have the engine magically replaced at no cost to you.

I must emphasize (again) that this is not an endorsement for defrauding or falsely representing oneself to any agency or authority: governmental, private-sector, or otherwise; it is merely proposed for entertainment purposes alone.

To be honest, I love my car (the '95 E320) almost as much as my '91 300D. There was a point a few years ago, however, when I would have considered trading it for a used Peugeot or Fiat.

In an anxious moment, I went out to my '95 today and double/triple/quadruple checked that my main wiring harness is intact. So far, no need for sleepless nights re: main wiring harness.

I'll try to do some more research next week re: lower wiring harness and maybe if we get enough people together to purchase at once, we can convince a re-seller to give us a volume discount?

Hope you have nice weekends...It seems that my weekend entertainment has already begun

More soon

Last edited by batmanandbobbin; 06-13-2009 at 08:41 PM.
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post #5 of 12 (permalink) Old 06-14-2009, 04:43 AM
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The big money wiring harness is the upper. The lower goes to only a few items such as the starter, various sensors etc. Go to Buy MB parts dot com and see what you come up with.

Good Luck,

Jayare
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post #6 of 12 (permalink) Old 06-14-2009, 07:54 AM
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Thanks Jay thought it didnt go to much. I have noticed the thicker wires are not cracking though so like the oil sending wire is bad but its grouped by the alternator so its not shorting that kinda thing. The outer plastic is cover that also so seems safer by far.
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post #7 of 12 (permalink) Old 06-14-2009, 02:15 PM
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Lower harness #

The lower harness # is 124 540 4230. For 94-95 E320

$97 list, $75 at MB of Ft Lauderdale.

Mercedes Benz of Fort Lauderdale
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post #8 of 12 (permalink) Old 06-14-2009, 09:10 PM
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I was told that deterioration of the upper harness causes the car to run poorly, and deterioration of the lower sets the car on fire. Both were changed on my 46k mile 500E and after looking at the lower I was glad I had it changed.

1971 300SEL 6.3
1985 280TE 5spd
1986 190E 2.3-16V
1986 300E 5spd 24hoursoflemons car.
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post #9 of 12 (permalink) Old 04-24-2018, 11:22 AM
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post #10 of 12 (permalink) Old 04-24-2018, 11:44 AM
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The lower harness has recently become NLA, but is easily rebuildable.
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