First of all a resistor color coding of Yel-Vio-Yel is 470Kohms not 470ohms. You are probably reading some stray voltage in the circuit. Yes, both NEG terminals of the speakers are common. Usually a receiver that blows the main fuse has a power suplpy problem. Check the recifier diodes for shorts. Other than that, the output transistors may be shorted.
Check those out and post the results.
Dan
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