The first thing I would do is try to eliminate all variables and test the voltage directly at the board. This is obviously what you have been working on with the batteries but I'd go first for a VERY direct approach. Expose the board and with the car OFF, CAREFULLY check the voltage with all 4 batteries in the car at the solder points where the negative and positive wires are attached to the board. This verifies without any question if the appropriate voltage of at least 4.8V is reaching the board of the car. Once you have tested it in this way I feel that we can eliminate any kind of battery or battery wire connection to the board as being the culprit and move on to other possibilities.
EDIT: I actually see now that this suggestion was already presented, though I'm not clear on your answer. Was there appropriate voltage?
Last edited by Action B; 09-11-2009 at 03:03 AM..
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