Henry, a full charged lead acid 6 volt battery AT REST AND STABILIZED should read close to 6.3 volts. HOWEVER A real test which many sellers offer for free IS A LOAD TEST I suggest that be performed ASAP.
Next if a battery tests okay under load and is full charged, while subject to starter draw and battery condition and capacity, I might expect it to drop to as ow as even 4.5 volts BUT NOT 3 VOLTS. NOTE if the starter switch or solenoid is bad/resistive (seen that often) it can drop voltage leaving low voltage on the starter motor itself. Those contacts can bet burned and pitted and resistive and corroded causing voltage drop across them EVEN IF THE BATTERY AND STARTER IS GOOD A BAD SWITCH CAN CAUSE THE PROBLEM !!!!!!!!!!!
If coupled to a good working charging system subject to battery and RPM at fast RPM Id expect the battery voltage to rise to at least 6.5 volts up to near 7
If voltage is actually dropping that low AT THE STARTER there's excess current flow and the starter motor itself could be the problem.
HOWEVER there can be many causes of excess voltage drop such that voltage remaining at the starter is so low such as
Bad/loose/resistive cables or cable connections or terminals Too small battery cables Bad resisitve ground connections Faulty voltage dropping mechanical push starter switch or electric solenoid starter switch
I suggest A good battery load test,,,,,,,,,,,Check each and every battery and starter and ground cable connection for rust or corrosion or evidence of heat,,,,,,,Check for voltage drop ACROSS THE STARTER SWITCH OR SOLENOID,,,,,,,,,,Use at least 1 Gauge or even 0 or 00 gauge starter and ground cables can help
If you can measure the voltage drop ACROSS THE SWITCH/SOLENOID or voltage on the starter input post and voltage on the switches BAT Input that can find a switch problem
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