If you've got a 6-volt starter that isn't working, I'd take it to an auto electric shop. Most of them can rebuild starters.
It depends on how the two six volt batteries are connected. If they are in parallel then the answer is no. If they are connected in series then the answer is yes. To find out for sure check the voltage that the starter needs. If it says 12 VDC then you will know that the two six volt batteries are wires in series and can be replaced with a 12 VDC battery.
Six Volt (unless it's been converted).
Is a eletromagnet with a six volt lantern battery really powerful or not?
Buying a six volt battery is better than 12 volt. If you buy the 6 volt takes up less power so it holds more.
Yes you sure can.
No! You need fewer cells for six volts. Most 9 volt batteries have six 1.5 volt cells, but a six volt battery has four 1.5 volt cells. In theory you could open the battery up and install a tap at the fourth cell, but that is pretty hard to do.
A 12 volt automotive battery has six cells.
connect the 2 six-volt batteries together one terminal each positive to negitive, this will make a 12-volt combination, then you can connect the jumper cables, one side to the 12-volt battery and one side to the two 6-volt terminals, + & -
A group of ten (10) batteries composed of 6 Volt and 12 Volt types will have six (6) each, 6 Volt and four (4) each 12 Volt batteries. The contributing voltages will be 6x6 and 12x4 for a total of 84 Volts.
depends on manufacture, Ford 1956, GM 1955, etc.
If it is a twelve volt system yes. If it is a six volt system, it isn't advisable.
Connect them in series.