Hey everyone I am almost done with my system and I have the rear seats out with all wires ran but I cannot determine a good ground. I saw a similar post but it is for the 3rd gen TLs and IS NOT the same as my 4th gen BASE TL. Under the back seat on the right hand side there is what looks like a grounding point for the cars electrical, it has a gold bolt and a gold flat piece under the bolt with a black and silver striped around 18 Gauge cord going to it. Is this a ground and can I use this for my amp and LOC? If anyone knows a good place it would be much appreciated I want to finish tomorrow. Thank you in advance and please be sure that the same point will be on my 4th gen as I said the 3rd gen is different. Under the rear seat is where I would like to do it. Thanks for everyones help.

 

On my 09 base TL I used a ground bolt exactly like you described BUT it was on the drivers side. I grounded my powered sub to that bolt, soldered a ring terminal to the ground wire and bolted it down. So I say yes to your question.

PLEASE tell me what amp you installed. I am very interested in replacing my base TL amp.

 

Not sure where you are placing your amp/LOC, but I just drilled a small hole in my spare tire well, sanded it to bare metal, put a nice big self tapping metal screw and good quality terminal on it and it is solid like a rock. Try to keep your ground as short as possible.