One the reasons why people upgraded from a 6 volt system to 12 volts system.
Is because, Unknowing owners mistakenly replaced their original worn battery cables with incorrect gauge cables.
Two ground cables are also required: One from the battery to the frame and one from a starter mounting bolt to the frame.
Most of today’s auto parts stores only stock the smaller diameter 12 volt designed cable.
Six volt starters require twice the electrical flow to operate properly. Don’t blame your six volt system for slow unacceptable starter motor speed! Many restorers go to the expense of changing their 6 volt system to 12 volts. They feel their original system was inferior and believe what they did was necessary. The problem could have been corrected with just adding the three proper cables.
Remember: Millions of cars and trucks were made with 6 volt electrical systems each year.
If they had not operated correctly they would have been built with 12 volt systems!
Speed Up 6 Volt StartingAlso electrons flow on the surface of the conductive material not through the center.
The more surface there is the better, multi stranded cable is ideal, I like large diameter welding cable.
Another reason why they changed from a 6 volt system to a 12 volts system.
It was getting harder to start the high compression OHV engines on 6 volts,
plus run all the power accessories such as power seats and air conditioning that were coming in at that time.
