Testing Resistance On Ground Locations

[AndrewHD 10+ year member]

Hello everyone, I just got a DMM and wanted to know what is the best way to measure resistance of grounds in the trunk. I want to measure the strut tower and seat belt bolt so that I can see which is better to ground my Rockford 1000-4ad. Thanks in advance

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[smoka 10+ year member]

You can't really measure the 'quality' of a ground location unless you are drawing a good amount of current through it. For instance you can have a tiny wire and the resistance would be very low, but run some current through it and it would heat up and show a much higher resistance.

Best way is to run a test tone and compare the voltage at the battery to the voltage at your amp. The voltage drop should be minimal if you have a good ground.