Battery tender connection
- Thread starter mikp
- Start date
I regularly use a BT on my vehicles. I checked the LC just yesterday and did not see an easy way to use a BT attached under the hood. Maybe a direct battery connection would work? But that means cord through door/window.
There’s a 12v hot post in the engine fuse box that has plate to clip a battery tender to, as well as a 10mm nut you can use to attach one if you wanted. If you pop off the cover, there is a diagram on inside of it detailing where it is.
Will this make it a PHEV? 
does this even make sense? How long will your vehicle be sitting? what is the connection between the hybrid battery and the 12v? I'm seriously wondering if there really is a practical need for a battery tender?
does this even make sense? How long will your vehicle be sitting? what is the connection between the hybrid battery and the 12v? I'm seriously wondering if there really is a practical need for a battery tender?
Last edited:
- Moderator
- #7
I use BTs on just about everything, except the 08 Taco. It doesn't have any doo-dads to discharge the battery, that rascal started 2nd key twist after setting idle for 8 months.
So now I'm curious if the LC's hybrid battery is disconnected from the 12v system with the key "off" or if it keeps the 12v topped off..........
(edit) It does not.
So now I'm curious if the LC's hybrid battery is disconnected from the 12v system with the key "off" or if it keeps the 12v topped off..........
(edit) It does not.
I hooked up the BT yesterday and it took about 20 minutes until I got the solid green charged light. A BT under the hood is not very practical.
The 12V plug on the AC control panel at the back seat is not hot when the vehicle is not running.
However, BT does sell a OBD port plug to charge the battery; as long as the trickle current is under 3 amps.
It would be possible to charge through the trailer plug, if the plug is “hot” when the vehicle is not running.
The 12V plug on the AC control panel at the back seat is not hot when the vehicle is not running.
However, BT does sell a OBD port plug to charge the battery; as long as the trickle current is under 3 amps.
It would be possible to charge through the trailer plug, if the plug is “hot” when the vehicle is not running.
- Moderator
- #9
Actually 20 mins not too bad, it takes my Mercedes 30-40
I have kept my LC 12v battery charge while “out of the office” for 60 + days by adding charger directly to the battery. This week I had to be in Chicago (freeeeeezing) and when I came back decided to plug charger to engine bay jump point and it showed 45%. Two hours later when I checked it was 100%. Truck is in the garage and it was easier to try the front. I have two other land cruisers that sit outside and have always started after 3-4 months of sitting while I am out of pocket, but those only have a horn and lights as “electronics”.
I can't say enough good things about the NOCO Genius GEN5X with the NOCO GCP1. In my GX, I did a lot of experimenting with batteries and charging before I switched over to using a Jackery to run my fridge. I made a mounting plate for it and tucked it away. It has a lead that bolts to the battery terminals. It just turned out so clean, and having the marine plug on the fender always made people curious.
More pics at:
More pics at:
I have read all the posts and talked to my Toyota dealer to ask where I should attach a battery tender. The Service tech said to attach it to the battery located in the back by the cargo area.
After talking to the Toyota Tech and reading the manual, I am still confused. I attach the connection to the battery that has the plug in connecter.
Any help will be appreciated. I’m retired and the LC will sit for long periods of time. Thanks all!
Attachments
- Moderator
- #14
There are two easily accessible locations for attach a battery tender pig tail. I have a pigtail in each location.
The underhood Passenger's side fuse box. Using the existing stud located next to the "Jumper cable" connection point (yellow dashed circle). You can add another nut to the existing stud.
The second easy place is to attach it to the existing stud, located on the "fusible link" connection point that is located on the 12v battery "POS" post. (under the red plastic cover). The red cable in the picture, I installed. Yours should have just a threaded stud.
What size and thread nut does this take? Also do you have a recommendation for the black cable?
Thank you very much!
- Moderator
- #17
I think they were a 8mm (can't remember if it was a 6mm or an 8mm). I ran an 8 gage from both locations to resettable circuit breakers and attached the pig tails to the C/B. As far as the ground cable, I attached it to a fender bolt at the front and one of the jack cradle bolts in the rear.
Thank You
Battery Tender installation is also discussed under this thread::
12 volt battery is important!-maybe an issue summary for error messages?
- Moderator
- #20
Above link:
www.landcruiserforum.com
12 volt battery is important!-maybe an issue summary for error messages?
Thought I would start a new thread since this keeps coming up for people. I think I have a decent summary after reading the manual and all the various threads about error messages and the car not starting and being towed. 12 volt battery charge and health is extremely important to make sure...
www.landcruiserforum.com
