When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Meter it. Set DMM for ohms, put negative lead on ground at the amp, put positive on the battery ground post. I like to see .5 or less on my crappy meter, FLukes generally should be more. That is taking into account for extending one of the leads.