Discussion in 'Electrical' started by Ped, May 21, 2020.
I am looking to get a new battery earth cable made up. Does anyone have a supplier source for this?
Have you looked on rock auto? I’ll have a measure up for you later.
Any motor factors or car wiring company should be able to make/supply one.
I asked this on another post, but what is the shipping cost/time like from RockAuto?
Rockauto can be just a few days. often quicker than tardy UK Ebay sellers.
These look like they maybe able to do you a cable.
Rockauto probably won’t be able to help as they supply mainly US car parts. The battery is on the opposite side in a LHD 280ZX. Not sure the cable will be the same length.
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.
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.
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?
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.
Same as mine - ‘77 260z.
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.
I must put one in, it can only improve things.
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.
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.
Just connected a spare earth lead from the battery to a convenient bolt on the bulkhead.
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