Battery Ground Bolt (Read and check yours!!!!)
I've owned my G8 for 5 years & have put over 135K on her, I love my car, I've modded her, pimped her out, & loved every minute of it.
But, Over the years I've had electrical issues including:
A horrible electrical whine in the cabin that would get lounder the harder you drove. Voltage drop upon ignition (engineering mode) random battery issue...etc.
Random starting issues (Click Click no start, slow cranking, Immobilization mode, limp mode, etc)
Dimming lights at night including my Headlights, Dome light, & vanity mirrors.
Well, it all came to a end on Sunday as I've found the culprit. My issue was the Bolt which secured the Ground Cable to the chassis!!!
You see this bolt is exposed on the underside of the car right above the driver side exhaust hanger. My bolt had corroded on the undersize and somehow began arching off the chasis ground. The lip of the bolt was MELTED!!!!!!
I carefully removed the bolt, cleaned the bore threats, cleaned the ground clamp, and replaced the bolt with a $1.50 bolt from a local hardware store. I then rehooked up the negative to the battery turned the key and my car started faster than it EVER has!!! That night I went for a ride....my headlights were brighter than I ever have seen them, dome light was fine, no dimming & that annoying whine had 100% vanished!!! Engineering mode now report my 1 month old battery holding a charge at 95%, My battery voltage at upon ignition is 12.4v and barely moves upon turning the key.
I've seen hundreds of post in this forum over the years about many of these issues......no one has ever mentioned replacing this bolt. If you are having ANY of these issues I dare you clean the ground area and bore and replace the bolt.
Last edited by wvg8gt; 11-07-2015 at 09:23 AM.