You load tested each battery? Can't be bad if cart runs good.
SOURCE: trying to power a amp with 16 volts. possible?
Golf carts do not have a charging system. If you are going to use battery power only, why not just add (1) 12V car battery instead of (2) 8V??
MA Audio runs (ran) their bench tests @ 17V. All the power ratings advertized are at 17V.
The power supply for the hk4000D is unregulated. So the more voltage = more power.. 8V-16VDC.
More input voltage means the amplifier will have to work less hard to make power.
Don't expect the amplifier to work for very long however. the current drain on a class D amplifier is huge. There are no on-board fuses protecting the power supplies, so be sure to have at lease a 150A power line fuse.
With 150A current draw - even with the amplifier at 1/2 gain - expect to get 10.6 minutes of listening time from your 16 volts before recharging - also note, the amplifier MUST see 8V to turn on, there is a built-in voltage sensor that will shut down the amplifier if voltage is too low.
SOURCE: How do I check 8 volt golf cart batteries with an Argus AA500P Battery Analyzer?
Use the voltmeter and connect the test probe (red) to positive side of the battery..the other side on negative
SOURCE: Why doesn't our Melex golf cart start after replacing batteries.
sounds like you have either a relay or computer that is bad, needs to be serviced
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