Possible grounding issue? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Armageddon · 05-31-2015, 11:33 PM

So, long story short, I have an amp that is overheating over time with minimal load. One of the options with an amp overheating is that the wiring may be the cause. So I started testing chassis grounding.

I've notice that the ohms between the amp ground point to the chassis near the battery practically 0 ohms. However, the ground from the battery lead to the chassis point near said battery is showing 2 ohms. Now this cable going from the battery to the chassis is all stock. The only additional wiring is the positive to the amp and the ground for the amp, both 4 gauge and as short as I can run them.

Has anyone else noticed their stock grounding cable showing such resistance in our cars? I'm sure I could simply add an additional 4 gauge wire from the battery to the chassis, but it just seemed odd.

GT86_PRAGUE · 06-01-2015, 05:18 AM

Quote:

Originally Posted by Armageddon

So, long story short, I have an amp that is overheating over time with minimal load. One of the options with an amp overheating is that the wiring may be the cause. So I started testing chassis grounding.

I've notice that the ohms between the amp ground point to the chassis near the battery practically 0 ohms. However, the ground from the battery lead to the chassis point near said battery is showing 2 ohms. Now this cable going from the battery to the chassis is all stock. The only additional wiring is the positive to the amp and the ground for the amp, both 4 gauge and as short as I can run them.

Has anyone else noticed their stock grounding cable showing such resistance in our cars? I'm sure I could simply add an additional 4 gauge wire from the battery to the chassis, but it just seemed odd.

I always wondered why Cusco make grounding kit for this car.

Armageddon · 06-01-2015, 10:31 AM

"Hey, lets take about $20 of wire and some connectors, put our name on it, then sell it to ricers for $200"

I have plenty of wire and connectors to proper ground the battery better, just concerns me it came from the factory that way.

GT86_PRAGUE · 06-02-2015, 09:13 AM

Quote:

Originally Posted by Armageddon

"Hey, lets take about $20 of wire and some connectors, put our name on it, then sell it to ricers for $200"

I have plenty of wire and connectors to proper ground the battery better, just concerns me it came from the factory that way.

I was more aiming at that might be known problem, if such product exists.

05-31-2015, 11:33 PM	#1
Armageddon Junior Member Join Date: Sep 2013 Drives: 05 tC, 13 Fr-S Location: Upstate SC Posts: 9 Thanks: 0 Thanked 0 Times in 0 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Possible grounding issue? So, long story short, I have an amp that is overheating over time with minimal load. One of the options with an amp overheating is that the wiring may be the cause. So I started testing chassis grounding. I've notice that the ohms between the amp ground point to the chassis near the battery practically 0 ohms. However, the ground from the battery lead to the chassis point near said battery is showing 2 ohms. Now this cable going from the battery to the chassis is all stock. The only additional wiring is the positive to the amp and the ground for the amp, both 4 gauge and as short as I can run them. Has anyone else noticed their stock grounding cable showing such resistance in our cars? I'm sure I could simply add an additional 4 gauge wire from the battery to the chassis, but it just seemed odd.

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06-01-2015, 10:31 AM	#3
Armageddon Junior Member Join Date: Sep 2013 Drives: 05 tC, 13 Fr-S Location: Upstate SC Posts: 9 Thanks: 0 Thanked 0 Times in 0 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	"Hey, lets take about $20 of wire and some connectors, put our name on it, then sell it to ricers for $200" I have plenty of wire and connectors to proper ground the battery better, just concerns me it came from the factory that way.

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