In Reply to: Re: 8 volt battery posted by Gary Ostby on December 26, 2017 at 11:53:16:
Gary -it is not the VOLTS you need to crank the engine, it is the AMPS. If the battery is more than 5 years old, it may be time for a new one. Battery must sustain a full charge under load. Only way to check that is with a hydrometer for specific gravity on each cell. Or, any starter/alternator shop will do it on their special equipment. I just take my stuff to a buddy with starter/alternator shop and have him bench test everything if I have any doubts. You can charge a battery all day every day but if it won't sustain that charge, it will be hard to crank over a cold engine. 2 volts ain't gonna mean diddly. I have had my early 8N as original -6-volt/positive ground since I bought it like that. I have had it parked outside many times, tarped, and never had any problems starting it cold weather. Why? I followed the 6-volt Mantra -Clean Bright and Tight. I keep the PM up and every fall ensure it is ready for winter -fresh oil, tune-up, tested and charged battery, and all in working order. If you still had slow cranking, Id suspect the battery is not at 100% and look into that before buying parts you may not really need. Most starter shops will bench test for free. Some franchise auto parts stores will too, but I'd only trust a familiar one so they don't just tell you it is bad so they can sell you a new one. The cold will affect your battery no doubt, especially if weak or discharged. Good correct battery cables are also necessary for the 6-volt system.