Finally upgrades to 143 amp alternator. Ran a #2 ground to alternator bolt and 2 #6 to alternator output. and a # 10 to the for the small wire. All terminal ends are soldered on.

I can idle with headlights on high , fog lights on after-market driving lights on and my Fluke meter reads 13.98 volts. What an amazing upgrade.

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1989 Arctic White 190D 2.5l auto w/400E Brakes and a 5spd waiting for me to install

1977 280SL Euro M110/w 4spd

2001 Dodge Ram 2500 Quad cab 4x4
dyno 383hp / 916ft#'s

... not sure of the need for this step.
the alternator is attached to a solid aluminum bracket, bolted to the block, and there is a large copper braid connecting the block to the body of the car.
this would eliminate the possibility of a voltage drop from the battery to the block through the body I suppose...
certainly if charging issues are happening, adding an additional ground to the alt frame could help. as could cleaning all the existing connections, and brackets.
Hmmm...

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

a quick buzz with a dremel tool and a steel brush on the mounting holes for the alternator is always a good thing... and a dab of dielectric grease. solved a number of charging problems for me....

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All it takes for evil to prevail is for good men to stand by and do nothing.

Too many people tip toe through life, never attempting or doing anything great, hoping to make it safely to death... Bob Proctor

'95 S320 LWB
'87 300SDL
'04 E500 wagon 4matic