Electricblue is right about batteries that have been fully discharged more that once. My cruiser sat around the body shop for 3 months during repairs. It was started and moved into and out of the repair bays and moved around the lot to make room only. Eventually the battery life was an issue. If I started it every day and drove it a little or alot (didn't matter which) it would start & run every time. But let it sit for 2 days without starting it and it did not have enough current to turn the engine over. A little jump on the battery would get it started again. I finally got tired of that s**t and went out and got an Optima yellow top deep cycle battery, It required some cutting and grinding of some metal under the fender though. The model 51R is the only model that I could find that had the proper polarity to keep the positive terminal away from the drivers side fender in the engine compartment. Ian is right too, when the battery gets borderline low and the power supply for the PCM gets dragged down the PCM will do some freaky things.....
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