£4k SL500 wiring loom replacement

beavere38

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Hi everyone,

I went to look at an SL500 last Tuesday, liked it and agreed to buy it (left a deposit). The car trader offered me a very good p/x price on my current car. He agreed to do a few jobs on the car such as new 20' inch rear tyres, refurb the alloys, new front discs and pads, new interior mats (were missing) and some other minor stuff.

When I had viewed the car they pointed out that they'd just fitted a new battery as the old one was dead.

Anyways, he called me Saturday and said there was a problem. The car had a flat battery again next day and after getting it into the Mercedes specialist next door to them it turned out there was a voltage drop (short circuit) on the car. After further investigation it turned out that the gearbox oil had been leaking through a seal and under pressure had got into the wiring loom and worked it's way into other parts of the car.

One of the mechanics at the specialist with over a decade of experience at Mercedes had seen this once before and the car in question needed a new wiring loom (which involves removing the roof) as well as some control modules and basically this car may need £4k spending on it to get it sorted out.

The trader has told me he can't afford to do this and will refund my deposit and sell the car through auction instead.

So my questions/concerns are:

1. Is this a load of bull? I can't imagine there being some wiring so very close to the gearbox that a trans fluid leak can force it's way into the wiring loom like this?

2. If this can happen then I shouldn't be buying one of these as I wouldn't like an unexpected £4k bill due to a gearbox seal failing.

3. I think it more likely that he has overvalued my p/x and then realised the expense of getting the jobs done to the SL and found he's going to make a loss?

Any advice/comments would be most welcome!
 

drivinggod09

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maybe get rac inspection on it letting them know the suspected problem or walk away with no loss
 
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beavere38

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At the end of the day the trader has said he doesn't want to sell me the car so I'm not going to push to buy it. There are plenty more out there. I'd just like to know if he's feeding me a line or not!
 

Bolide

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BMW 525 Diesel Touring
You trusted the trader enough to give him a deposit and agree to buy a car from him. Then, after he explains a problem in some detail, you no longer trust him?

Most traders don't have the time or the inclination to play games with cars or customers. I'd chalk this one up to experience, thank him and then ask him if he could possibly help locate a car for you

That way the time you've both spent on this is put to good use and not wasted

Nick Froome
www.w124.co.uk
 

MRL

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ive seen it happen before on a few different models the worst being a 230 chassis SL and ended up being a £20k warenty bill

the electric plug on the valve body coming out of the gearbox leaks oil (mercedes have just released the 4th generation seal to stop this, black and not whit like the ones that leak) into the wiring and the magnetic field caused by the electricity in the wire causes the oil to travel along the loom, as the gearbox loom goes inside the car in the passenger footwell it gets in to most of the looms on the car and can make a real mess.

its the same problem you get when the cam magnet leaks on a 111 engine and can kill the ECU and the O2 sensor


if he has offerd the deposit back id take it as it may be £4k to replace the loom but you dont know how many control units it has got in to
 
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beavere38

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Thanks for the replies - sounds like it can be a common problem and I'll know what to look out for in future.

Cheers!
 


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