i havea '95 explorer with 118thou kms on it. while running on a moderate speed for an hour, the light of the "engine" sign on the dashboard turned on although the the engine continued to run. after turning off the engine and started it again, the light turned off. but after a while, it turned on again then continued for half an hour then the light of the "battery" sign turned on. then the engine stopped. although the engine ran again, the 2 signs did not turn off. after about 5 days of non-use, i used the truck again somewhere near, cautious that the signsmight turn on again but theydid not. can you tell me what does these mean? thanks!