[eagle]

First off, get a decent quality voltmeter and put it across the battery, check the voltage drop there when running starter. If voltage drops a lot, then its either a starter pulling too much current or a weak battery. If voltage stays relatively stable there, then put the meter from the ground post of the battery to chassis, you should get only a couple tenths drop there with starter running. Same thing when checking from power post to starter battery terminal, should be very little voltage when cranking. If you get much voltage drop, you have a bad connection or a bad cable. One thing to remember, lots of people will tell you to get rid of the 6 volt and convert to 12V. Problems show up sooner in 6 volt, but if everything is in good shape it will turn over the engine just fine.