Posted by Bob M on September 28, 2011 at 11:15:44 from (69.207.87.100):
In Reply to: Cub Electrical posted by Michael Shouse on September 28, 2011 at 09:27:33:
Michael – If the battery is installed negative post grounded, the ammeter will read “backward”. IE when the ammeter shows charge, the battery is actually DISCHARGING.
However as you have found, the engine will run a long time (many hours) from a non-charging battery before it goes flat. (If your Cub has a magneto it will run indefinitely – the battery is used only to crank the engine).
Solution: 1 – Charge the battery 2 – Reconnect the battery with the positive post grounded. 3 – Check ammeter operation: With the engine off, turn on the ignition or lights. If the ammeter shows discharge you are set. However if it shows charge, swap the wires at the two ammeter posts. 4 – Polarize the generator: Again with the engine off, momentarily jumper the BAT and GEN connections at the voltage regulator or cutout relay. 5 – Now start the engine and see if the ammeter shows charge when running at half throttle or faster.
If it now charges you are all set. If it does not, post back what you find and we’ll help you identify the problem.
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