Any even samll resitance will reduce the supply at the starter /Solenoide.
R = 0,05 Ohm = > at 100 Amp => 5 Volt!!!! Dead..
well the resistance might only be 0,01..still..
and at Start woow.. R = 0,01 at 300 Amp = > still 3 Volt supply..
check the cable from Bat minus (-) to ground in the front trunk. Re-fix it after cleaning..
The Solenoid fixtures (engine bay) should be copper, well oben the 2/TWO screws at the solenoid (left & right) and clean the stuff..(light abresive), may be also on the starter itself. Same thing..
And Sure ...
quote:Ground cable to the battery where it attaches to the chassis. Change the engine to the chassis ground strap.
..within the engine bay!
That should work...
Matthias