MG Sports Cars

engine swaps and other performance upgrades, plus "factory" and Costello V8s

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rficalora
Rob Ficalora
Willis, TX
(2764 posts)

Registered:
10/24/2007 02:46PM

Main British Car:
'76 MGB w/CB front, Sebring rear, early metal dash Ford 302

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installing wiring harness - question on grounds
Posted by: rficalora
Date: May 29, 2010 07:18AM

I'm running my wiring harness. My harness, like most universal kits, does not have the grounds. Do you guys recommend running ground wires to the various devices or do you ground things "locally"?

Also, how important is it to run a ground from the battery all the way to a starter bolt. I didn't do that. I have a short ground lead from the battery to the chassis but when reading internet articles on the above, I ran acros a couple of places that "strongly recommend" ground from battery to a starter bolt. Ron Francis wiring says "we can't stress that enough."


kstevusa
kelly stevenson
Southern Middle Tennessee
(985 posts)

Registered:
10/25/2007 09:37AM

Main British Car:
2003 Jaguar XK8 Coupe 4.2L DOHC/ VVT / 6sp. AT

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Re: installing wiring harness - question on grounds
Posted by: kstevusa
Date: May 29, 2010 09:11AM

Rob, on the 78 B, I ran a dedicated large gauge ground from the battery to the main ground location near the relays on the right side of the engine compartment. suggest you locate a main ground point somewhere in the Ford relay area. Once this is done, you have a convenient place to connect direct to engine and later to the ECU if you decide to go EFI. My is grounds direct to the trans, engine,alternator, and to the central ground at the harness (oem).
Remember "YOU CAN'T HAVE TOO MANY GROUNDS!)
SAFETY FASTER!


Dan B
Dan Blackwood
South Charleston, WV
(1007 posts)

Registered:
11/06/2007 01:55PM

Main British Car:
1966 TR4A, 1980 TR7 Multiport EFI MegaSquirt on the TR4A. Lexus V8 pl

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Re: installing wiring harness - question on grounds
Posted by: Dan B
Date: May 29, 2010 11:22AM

Hi Rob,

I agree with Kelly. On my TR4A I have installed a heavy gauge ground directly to the starter mount. I also have a strap that runs from the engine to the body. Overkill is good.

Dan B
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BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(6470 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

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Re: installing wiring harness - question on grounds
Posted by: BlownMGB-V8
Date: May 29, 2010 09:53PM

On the MGB I like to run a heavy cable from the battery to the transmission tailshaft extension. You can't have a more direct connection to the starter than that. Use a cable with the smaller second lead and ground that to the chassis and you're done.

JB


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