Most older 6 volt systems spin the starter slower than 12 volt systems. The starter bushings get worn and the armature starts dragging on the fields and this really slows things down. Add to this that the motor's compression gets down a bit so the motor needs to spin faster to start. Then add in the Ford factor and things get real interesting when the motor's hot.
If you have a good starter and the cables and grounds are making good connections they'll usually start. Around here a lot of farmers with an old 6 volt truck put in one of those 8 volt batteries to spin the motor that little bit faster. A 6 volt generator usually charges 8 or 9 volts anyway so you don't create any problems. The odd time you have to crank up the voltage by adjusting the regulator to get it to charge 9 volts but that's it. Most battery companies make an 8 volt battery.
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1940 Cab 11 C8 Wireless with 1A2 box & 11 set
1940 Cab 11 C8 cab and chassis
1940 Cab 11 C15 with 2A1 & Motley mount & Lewis gun
1940 Cab 11 F15A w/ Chev rear ends
1941 Cab 12 F15A
1942-44 Cab 13 F15A x 5
1942 cab 13 F15A with 2B1 box
1943 cab 13 F15A with 2H1 box
1943 Cab 13 C8A HUP
1944 Cab 13 C15A with 2C1 box
1943 Cletrac M2 High Speed Tractor
MkII Bren gun carrier chassis x 2
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