Quote:
Originally Posted by Mikester
^^Dude, I tested every point imaginable in search of a decent ground... The spare tire post had the same 0.2ohms as everytihng else- Spot welds or not it is fine for use as a ground. Whoever you are getting your info from was probably basing what they told you from experience dealing with typical S13 rusted out spare tire bays where the spot welds there are falling apart. Your original post said that it was "not good because it is only held in place by a few spot welds." Using that logic, nowhere on the car is a good ground... BTW- the multimeter doesn't lie 
If there is solid metal-to-metal contact & continuity to anywhere else on the chassis; it perfect acceptable to use. My choice to not use it had nothing to do with acceptability as a ground and everything to do with keeping the install clean.
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I asked my audio guy and he said, and I am quoting "No one serious in any audio competition would EVER use that for a ground - what does that tell you?" Sorry, I am listening to his 25 years in auto electronics experience over yours.
Anything bolted to the frame (like my audio is now) is not relying on spot welds. Over and out.