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I switched to M-1 15W-50 hoping that this would be my
"easy fix". While I did note slightly improved cranking speed, it was
still not sufficient to start the car. Additionally, after what I would
consider a short period of time the crank speed would diminish to almost
nothing. I thought this might be a bad battery or starter, but both are
almost new, so I figured I'd look elsewhere. What I ended up doing was
replacing the battery to chassis and battery to starter cables with 2/0
gauge cable. I also added a second ground strap directly from where the
battery to chassis cable attaches to the body to one of the starter
bolts. Over time, a ground cable looses its conductive properties, even if
it looks good physically. I figured since this was probably the original
ground, it might need some assistance. While I had access, I also replaced
the suspect starter to junction block with a 4 gauge cable. The original
appears to be around 10 gauge. Considering that this wire feeds everything
besides the starter, I felt that a little stouter cable would be
advisable. The hot in start wire to the starter was also replaced, since I
could see where the jacket had worn through in certain areas.
The results were far better than I had hoped. Crank speed is SIGNIFICANTLY
increased; at 0 degrees it cranks like it used to at 40. Also, crank time
has been extended. I have yet to feel a reduction in crank RPMs, even on
very extended crank periods. Additionally, all of my electrical devices
seem to work better. My power windows are faster, and my headlights don't
dim when I use other accessories.
I spent a grand total of about 3 hours and $50 to replace/add these cables
and it was definitely worth it. If you feel your vehicle isn't cranking
the way it should, and you've eliminated the starter or battery as the
problem, this might be something to consider.
J.B. Hebert
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Ref: Frank Mallory's database and https://mercedes-benz-publicarchive.com