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Old 11-28-2003, 12:23 AM   #1
Scooby Specialist
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2006 Outback 2.5 XT
Garnet Red Pearl 5MT

Default Single-point ground mod vs. Multi-point ground mods

Calling all electrical engineers!

With all the questions about the ground mod lately, I got to rethinking the merits of a single-point ground system. I've seen many ads in ricer magazines for the HKS Circle Earth system, which is a multi-point system (think "daisy-chain") with several wires connected to each other on different grounds in the engine bay. The advantage to this type of ground system is that far fewer wires must be connected to the negative terminal of the battery, which avoids overcrowding the post on the negative terminal [I had this problem, I put too many crimp connectors on my negative terminal for my SPG mod and the negative terminal ended up popping off really easily ]

In terms of offering the least amount of resistance (ohms), what is the best type of grounding system?
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Old 11-28-2003, 12:47 PM   #2
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1990 Legacy & 97 OBS


You don't want to use a multiple point ground system or daisy chain. Any differences in resistances will build up along the chain.

You definitely want to use a single point ground. You don't need to have all the wires going back to the battery. You can have the single source be on the intake manifold or something like that. As long as everything runs back to one point. That's what matters.
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Old 11-29-2003, 12:44 AM   #3
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Ahh, I see. That makes more sense! I never thought of it that way. Very cool.
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Old 11-29-2003, 01:22 AM   #4
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they are all grounds.. all on the same node, resistance shopuld not be an issue.. you're not passing any current through the wire. go with the circle kit.. makes for cleaner look
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Old 11-29-2003, 01:27 AM   #5
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if youre not putting current through the wire ever, why bother with a grounding kit? A parallel connection to the same node is of the same merit as connecting everything to a point and connecting that to ground, or daisy chaining the ground points. i know nothing about the grounding kits/modes but know quite a bit of circuit analysis. The resistance of copper wire is negligible. 2.6u-Ohm-cm. no big deal.
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Old 12-05-2003, 04:21 PM   #6
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2004 German
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you must exp with diff grounding points. that resistance bs is incorrect. as all points WITH a solid CLEAN METAL to METAL ground serve the same purpose. the only time this is a problem is with audio equipment. one ground will help eliminate or REDUCE ground noise or loop and isolation problems with signal fluctuations. variable and static. or HUM as it sounds like.

ground away. just remember to use engine bay gade silicone to seal of the sanded, bare metal. this prevents rust.

also, more than 5 grounding points it useless extra weight. daisy chaining isnt anissue, but what if that daisied point has a low flow? youve now defeated the purpose. my point: ground wisely with knowledge.

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