10 is an alternator signal problem same wire as indicator light. probably broken wire the yellow one. as for the 13 code it does not apply to LPG trucks. need more info on that unit. is it possibly 2 codes (10 and 3)? if so 10 is the alt signal and 3 is the switch in the accelerator sensor assy. do you have a book? post your email and someone will get you some literature
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