I have a 92 lx 5.0 with a fair amount of motor work done to it. Even before I did motor work n it was all stock, when I come to a stop, head lights dim and oil pressure gauge drops really low. Oil pressure drops at a stop, even with no head lights on, no radio or fan. I have recently replaced alternator and battery with new. I have had this problem for years and would like to try and fix it. Any ideas would be greatly appreciated.