Better Chassis Grounding

With the increased power demands and better battery in the FJ I figured it was time to upgrade the chassis grounding. Toyota uses a wire gauge that I consider to small for the demands that we are going to place on it. With the new grounds in place the starter does turn noticeably  faster.

First I replaced the battery – chassis ground with a 2 gauge wire. The original wire must have been about 8 gauge.

Battery Chassis ground

Second was to install another block to chassis ground. Again I utilized 2 gauge wire for this ground.

Additional block ground

I am going to continue through the FJ and replace or install additional grounds. The following still needs to be completed:

  • Frame – chassis
  • Chassis – hood
  • chassis – doors

The grounding of the doors and hood will improve the performance of my radios as well as provide and better Faraday shield in the event that we are struck my lightning.



Tomas has lived in Colorado since age 5. Having grown up on the Western Slope of Colorado lots of time was spent in the Desert Southwest. Tomas' father introduced him to the love of 4 wheeling at an early age in the high mountains around Aspen, Colorado. While an avid Mountain Biker, Tomas and his Family enjoy adventures in the mountains and desert in the remote locations that can only be reached by 4wd. Day hikes are always a must when on the family trips. While enjoying outdoor activities he wants to share his love as a certified 4wd trainer and ski instructor. Tomas also enjoys caving and cave exploration. Tomas currently resides in Colorado Springs. 


  4 comments for “Better Chassis Grounding

  1. fj_najd
    September 11, 2010 at 6:55 PM

    Hi dear

    First I want to congratulate U for the new FJ and to sorry about the old one.

    Second I had this idea long time ago but when I ask expert hear home they told that there is no need for it!

    I need to know if it is worth the work
    My loads are 2 extra 12v sockets and HID kit 35W and auxiliary light LED 36W and 220V converter AC-DC 1000 W

    I am thinking of adding more stuff but I don’t know how to calculate the load by amp to chose the right fuse

  2. Ray
    September 13, 2010 at 7:48 PM

    Good Day!
    Can you send me a better picture of your chassis to motor ground? I run a Yaesu FT-857 HF/VHF rig in my truck and grounding is very important, but I have always overlooked this.
    Second, how do you propose to ground the back door? I have a very “sloppy” grounding back there for my HF antenna… I would like to see how you do it; perhaps compare notes.
    Drop me an email if you have a chance!

  3. Tim
    October 3, 2010 at 8:33 AM

    amperage is calculated by taking your watts and dividing by volts. ie: 35w divided by 12v = 2.91 amps

  4. Chasen
    March 29, 2018 at 8:23 AM

    Can you please help me with the exact location of the block to chassis ground. I am having a bit of a problem locating that. Thank much!

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