Hey guys just a quick question.

What would cause my voltage to drop to 10v at idle but when i start driving it goes up to 10-13 volts..Im stumped..also my engine idles at 300rpm really low im thinking this could be the cause..

88 Cherokee 4.0 non high output (stock)

 

Sounds like alternators getting ready to die on ya . cs130 is what you have .

 

if 10-13 volts is your high mark now your alt is going out. pull it and have it run on a bench and also put a meter on it while on the jeep to make sure its not the gauge. check your belt too, it may be loose

 

+1 on checking the belt first, if is tight your alt is prob junk.....stick a multimeter on the bat while its on, I'm not sure of the exact spec but anything lower then 13.5-13.8v is suspect