Battery earth cable question | The Z Club of Great Britain
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Battery earth cable question

Discussion in 'S130(280ZX) Electrical' started by Ped, May 21, 2020 at 12:18 PM.

  1. Ped

    Ped
    Z Club Member

    I am looking to get a new battery earth cable made up. Does anyone have a supplier source for this?
     
  2. AliK

    AliK
    Z Club Member
    Staff Member Moderator

    Have you looked on rock auto? I’ll have a measure up for you later.
     
  3. Bazzateer

    Bazzateer
    Z Club Member

    Any motor factors or car wiring company should be able to make/supply one.
     
  4. Ped

    Ped
    Z Club Member

    I asked this on another post, but what is the shipping cost/time like from RockAuto?
     
  5. jonbills

    jonbills
    ZClub Administrator
    Staff Member Moderator

    Rockauto can be just a few days. often quicker than tardy UK Ebay sellers.
     
    AliK likes this.
  6. Huw

    Huw
    Z Club Member

    Last edited: May 22, 2020 at 12:10 PM
    Paul_S, AliK and jonbills like this.
  7. Rob Gaskin

    Rob Gaskin Treasurer Staff Member Moderator

    Does your car have a second smaller cable to the body from the battery post?

    Whilst you are at it check you have a connection from the engine to the body block/ bellhousing to the body.

    I've discovered that neither of my 2 cars are 'grounded' properly from the battery -ve! One was relying on an earth strap from the engine and the other one .... I just don't know, so assume alternator earth.
     
    Last edited: May 22, 2020 at 11:32 PM
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  8. Ped

    Ped
    Z Club Member

    The battery negative clamp broke ages ago, so I soldered on a Halfords-in-a-packet replacement one. It works, just doesn't look great.

    As far as I can see the earth is a single thick Black/Yellow wire running from battery post to the starter motor mounting bolt. Not sure if there is another earth somewhere... and yes I have repainted the starter motor thanks for noticing. :smash:

    [​IMG]
     
  9. Paul_S

    Paul_S
    Z Club Member

    That's what was missing on mine so I fitted one.

    Rob - should there be a wire direct from GND from the battery to the body?
     
  10. Bazzateer

    Bazzateer
    Z Club Member

    Mine (76 260Z) only has the cable from the battery -ve terminal to the engine, nothing straight to the body from the battery. There may also be a shorter one from the engine to the body but I haven't looked that far.

    I may fit one tomorrow as I'm doing an oil/filter change.
     
    Last edited: May 22, 2020 at 11:24 PM
  11. AliK

    AliK
    Z Club Member
    Staff Member Moderator

    Same as mine - ‘77 260z.
     
  12. Rob Gaskin

    Rob Gaskin Treasurer Staff Member Moderator

  13. Rob Gaskin

    Rob Gaskin Treasurer Staff Member Moderator

    Yes.

    However if you have a good earthstrap from the engine to the body that will help greatly.

    Don't forget that your engine/transmission is mounted on rubber. So if you don't complete a circuit for the current to flow from say your lights it will have to use whatever it can - the starter is ok because it's mounted on the engine that the battery -ve lead is bolted to.
     
    Last edited: May 22, 2020 at 11:34 PM
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  14. MaximG

    MaximG
    Z Club Member

    I must put one in, it can only improve things.
     
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  15. toopy

    toopy
    Z Club Member

    I have the main cable to the starter mounting bolt as above, it also has an earth from an engine mount bolt that feeds into the engine bay loom, no idea if that's original or not, it could have always been there or 4 ways could of done it when they restored it.
     
  16. Rob Gaskin

    Rob Gaskin Treasurer Staff Member Moderator

    The main point is that the -ve of the battery should be connected to the body because the body is used as a return path. The alternator -ve is connected to the body on the brake junction on the inner wing.
     
    MaximG likes this.
  17. Bazzateer

    Bazzateer
    Z Club Member

    Just connected a spare earth lead from the battery to a convenient bolt on the bulkhead.
    20200523_143553.jpg
     
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