hearnia
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| posted on 7/8/05 at 06:08 PM |
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Negative bonding
Ok, so I'm nearly ready to power up my loom and was just carrying out some checks before I go any further.
I came to checking that the negative side of the battery was bonded to the chassis and engine etc. but found it was open circuit on my meter?!?! Am I
being completely retarded or should all of these items be bonded?
The engine and chassis are bonded with low resistance so the problem is not there.
I've used the standard R1 loom and extended parts and added parts where necessary. Havent quite finished wiring in the lighting switches and
ignition but I dont expect this will have any effect?
Any ideas would be greatly appreciated.
Cheers
Joe
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britishtrident
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| posted on 7/8/05 at 06:24 PM |
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What have you go the main battery earth cable bolted to ? it should run to either the chassis or the engine/gearbox.
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rusty nuts
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| posted on 7/8/05 at 06:31 PM |
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Check that the battery connections are clean and tight. Dirty terminals can cause an open curcuit., clean the battery and the lead .HTH
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hearnia
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| posted on 7/8/05 at 06:33 PM |
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The main battery earth cable goes from the negative side to a place where the positive and negative bolt and there are fuses in between them.
Then there is a second wire which bolts to the engine and then onto the chassis (linked into the loom with another connector).
I'm going to go and have another look in a minute to try and spot anything obvious, once I've cleared my head of solder fumes.
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rusty nuts
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| posted on 7/8/05 at 06:40 PM |
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Do you mean that you have a fuse in the battery neg to chassis/ body side of things?
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johnjulie
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| posted on 7/8/05 at 06:47 PM |
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The -ve earth side of the battery should connect to the chassis, and the chassis should be connected to the engine.
Cheers J&J
JFDI
"Just F*****G Do It"
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hearnia
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| posted on 7/8/05 at 07:13 PM |
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Sourced the problem now, there was a slightly fatigued spade connection that needed cleaning.
Thanks for your help.
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britishtrident
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| posted on 10/8/05 at 12:16 PM |
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The main earth shouldn't connect through a spade connector it should run straight to the chassis or engine.
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chrisf
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| posted on 10/8/05 at 01:14 PM |
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quote:
...it should run straight to the chassis or engine.
Not both?
--Chris
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David Jenkins
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| posted on 10/8/05 at 01:28 PM |
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I have a welded-in stud on my chassis, just below the battery. The negative battery lead is fixed to this with a nut, as is the hefty braided engine
earth strap and a few other loom local earths.
The negative lead should be the same thickness as the starter lead (or even thicker), and the engine earth strap should also be bigger than the
starter lead if possible.
David
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britishtrident
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| posted on 10/8/05 at 03:44 PM |
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quote:
Originally posted by chrisf
quote:
...it should run straight to the chassis or engine.
Not both?
--Chris
Some production cars do it with a single cable with 3 connections, but normally it dosen't matter as long as you have heavy duty earth braid
between the engine and the chassis.
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NS Dev
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| posted on 11/8/05 at 02:06 PM |
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.......................and we all know about what happens if you forget that item.......................oops.......................burning speedo
cable and speedometer
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