||08-07-2010 04:22 PM
the first rule of the charging system is you have to have a good battery. a bad battery can cause all sorts of goofy readings.
to check for restance in wiring , hook volt meter between positive post at battery and battery stud post of alt. . run engine with a load on alt (ie. head light on, blower motor on high, ect.). any reading above 0.2 volts is a bad connection in wiring.
second step is to repeat test except now the volt meter will be between the negative post of battery and the case of the alt. any reading of above 0.2 volts is a bad connection in the ground side.
check the two small wire connector at rear of alt. both wires should show 12 volts with key on.
these alts. also have field terminal on regulator. to test, hook volt meter to system voltage . ground one end of a test lead and the other is inserted in hole in rear of alt and contacts field terminal of regulator. ( the hole in rear of alt is labeled with an F. It is easer if you attach test lead to a small screw driver and then insert that into hole) if voltage raises when regulator is grounded , replace regulator. if voltage remains same replace alt.