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The Rascal 600/300, remove the seat, lift off the cover, unplug a battery, replace the old battery with a new one, putting the cable connections on the same way, red is +, black is -. Do the same with the next battery, reconnect the anderson plugs,reinstall the cover and seat and plug in the charger with the key on watch to see the needle raises up toward the full mark, allow to charge fully, overnight is good. keep the bats charged up not allowing them to drop below half way for the first 20 charges to break in the batteries. as a rule charge the scooter after every use! Scooter Doctor App
When the failure occurs does a light flash on the tiller. If you see a flashing light count the number of flashes get back to me, your controller has found something wrong. When the scooter stops short do any lights light or is the scooter completely dead. Take the batteries to a battery shop.Have them load test them. I have a Rascal 600t my batteries will put out 500 cranking amps. If the batteries test good have the shop charge them up for you. Does it work right now. Yes, check your charger. No, check the freewheel mechanism when its in freewheel mode it electrically disconnects the motor. Well this thing gets wet at times i have to WD40 mine to get it to work right. The last thing to do is but the back end up,run it, while wiggling wires. Pay particular attention to connectors. The toggle switch in the tiller often gets intermittent. On my scooter the plugs on my get loose causing my scooter to fault out or to stall.Hope this helps
Two constant yellow flashing lights indicates three things
1. Low voltage. Load test your batteries even if they are new. You may need to take them out and charge them on a car charger. Your charger won't work without at least 20 - 22 volts. Your inhibitor on the charger won't close to make continuity to turn the charger on.
2. With an olms meter check your front to rear harness for continuity. If you have a bad wire, replace the front to rear harness.
3. Third and most costly is a bad controller. No way to check that without replacing it. Check 1 & 2 first.