Ground Strap

Mar 11, 2017 8:03 AM - 1287 Views Create A New Thread

Builder's Corner

By Contact Information

Tomball, TX

What size?
If I'm running a ground strap from the engine to the frame, does it need to be substantial like 0/1? I know I've heard that running from a bell housing bolt to the frame is good. Ring in here guys! Thanks!

The forum at StreetRodding post today Willie Moore

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  • 32 Dodge
    Apr 11, 2017 at 6:40 PM

  • Hey Jim,
    I finally got the fuel management problems solved. Now the hood fits on and the fuel is under the blower case! As it should be.
    Car is running good and I will trek down to Prince Frederick when we get a Saturday with no chance of rain.

  • jimmothershead
    Apr 10, 2017 at 10:49 AM

  • Hey Jim this is Kenny ( okie34). I thought I had your information but I dont. Please private message me at I talked to you about a brake light switch.

  • jimmothershead
    Apr 9, 2017 at 8:38 AM

  • Jeff/Tazhog........yes, learned about proper grounding about 40 years ago. You are one fine rod builder. Headed to Good Guys Raliegh NC ??

    32 Dodge, Ron Francis, the best wire kit. Our new K-Mart Kruize Nite in Prince Frederick is kickin' butt. See ya there every Saturday.

  • jimmothershead
    Apr 9, 2017 at 8:30 AM

  • Jaybird
    Was the 1/0 battery ground cable connected directly to the back of the block ?
    Jim 410 535 1933

  • jimmothershead
    Apr 9, 2017 at 8:26 AM

  • Roby
    The size of a conductor is determined by the load. A starter can pull 120 amps when turning over so run a 1/0 ground cable from negative battery post to back of engine. 3/8" bellhousing bolt near the starter. From there a #10 to the frame. From there a #10 to a grounding block over the steering column. I use 3 grounding blocks in a wire job...ya can never have too many grounds.
    All current consuming devices must have a dedicated ground......the same as the neutral/white wire in your home. Steel is a resistor not a conductor, so do not depend on steel to move only 12 volts effectively. Most street rods today are loaded with electronic devices that depend on a true 12 volts.
    Every time I have a guy with a starting problem, it is not the starter, it is not the header heat, it IS incorrect grounding from the battery to the starter. He has grounded the battery straight to the frame. Then a cable up front from the frame to the engine = WRONG. Most of the time the battery is in the trunk 13 feet away from the starter. He is trying to push 120 amps with only 12 volts thru steel resistor frame and not considering voltage drop. So he is lucky if he has 10 volts when turning over the starter.
    Another constant issue is electric fan improper wiring and quartz halogen headlights that are grounded to sheet metal and not to the ground block. Undersized conductors also.
    Figure electric like a 1/2" pipe connected to the discharge side of your toilet.........go ahead, flush this morning's dump down that 1/2" pipe...........
    Needless to say, make certain all contact points are clean and tight.
    In 1957 at The School Of Hot Rod Hard Knocks, I learned how critical proper grounding is on my first engine swap. Since then I have wired about 200 cars. I carry 23 active Master Electrical licences here on the East Coast since 1966.....don't mean to be bragging just trying to make a point.
    Questions ?, Jim, 410 535 1933 at The School of Hot Rod Hard Knocks since 1957

  • Jaybird
    Apr 4, 2017 at 9:01 PM

  • What Sam said. I pretty much ruined a motor/intake/radiator from electrolysis last year. Had just put this motor together and put the car away for the winter. I forgot to shut the battery switch off. The system was grounding through the coolant from the radiator to the block. This is what my thermostat looked like afterwards....not to mention the heads and intake.

  • GeneF
    Apr 4, 2017 at 12:19 PM

  • I ran across a picture...

  • SAM1951
    Mar 18, 2017 at 9:03 PM

  • aluminum radiators must be grounded too!!

  • 36sedan
    Mar 17, 2017 at 9:45 PM


  • 32 Dodge
    Mar 17, 2017 at 6:39 PM

  • Does an aluminum radiator have to be grounded?

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