Many amps have the max power draw on the back near the power cord.
Elder amp draw.
The issue is not going to be the belt and deck at least not entirely more on that later.
An amp running at at a low stage volume may only be putting.
A high unloaded amp draw signals an issue with the drive motor over tensioned drive belt bad bearings in the front and or rear rollers and or an over.
In some cases like circular and table saws amperage draw can approach 15 which may make a standard 15 amp circuit marginal.
You could also get a current or power meter between the amp and the socket.
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If your amp draw is high unloaded there is an issue with the system as it is currently running.
The corded tool power draw in amps is important when it s time to figure out what size extension cord is acceptable.
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Obviously the max power draw only happens with the amp dimed so a meter would be the best way to find the power drawn under given conditions.
The kenwood head unit with built in 4 channel amp that i used for my son s boombox consumed 0 5a at very low volume and 1 to 2a at reasonably high volume.
Ot general amp draw of a car stereo.
It s how much power they draw that is important.
This was the average current draw taken with a slow responding dvm so i would expect much higher peak current draw but did not measure it.