Causes for low voltage at idle Wrong pulley on alternater Dirty ground connections Too much load at idle (a/c lights,radio, cooling fans etc all on at once) Bad battery or dirty connections Blown diodes in alternater causing low output With the alternater putting out voltage with a fully charged battery should be about 13.5-14.5 volts at the alternater with low ripple. David Teitelbaum vin 10757 --- In dmcnews@xxxx, "dsscid" <shain@xxxx> wrote: > Hello Everyone, > > Recently (probably ever since i got the new alternator) i have been > experiancing low voltage when i'm at an idle.