M-h 81 won't start with new battery cables

I have a MH 81 that would run good but the 6 volt battery would barely turn over the engine when starting. I put 00 battery cables on and now the engine turns over faster but I don't have any spark at the plugs. I didn't change anything else. The test light shows current at the points. Any suggestions?
Thanks
 
Voltage at points when they are open. No voltage when points are closed. ( grounded.)
You should have Battery voltage to the coil. The points are on the ground side.
 
Electric is always a big mystery to me, but one thing I do know - get that battery ground strap directly bolted right to the starter mount bolt. Don't go through a lot of rusty old corroded frame joints. Youi eliminate lots of resistance and loss that way.
 

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