Its been doing this for probably two months now...I really dont know how long but whatever. I have a S4 plug n play alt on my 83 GSL. Normal driving the volt guage is usally at 14. When I turn on my blinker(s) The volt guage goes back and forth from like 14 to 13 with the blinker. Also, when I turn on the dash light and side marker lights, the voltage will drop a little bit, then when I turn the headlights on, it goes down more. Same thing happens with the air conditioner on, radio, power windows. Ive searched a lot and haven't really found anything.

 

Electrical connections may be getting weak or the alt might be weak. As long as it keeps the battery fully charged, I wouldn't worry about it much.

 

Ok, well i'll get the alt checked soon like next week after I get my license . Its just funny how the volt guage is going up and down when the blinker goes

 

Thats a good sign that the alternator is charging. I wouldnt worry unless the gauge drops and cant get up.

 

Ok, thanks guys

 

haha mine does the same thing. been driving it like that for awhile no problems here.

 

Ok, cool.

 

Mine's been doing that since I got the car. Stock replacement alternator, only difference is that the gauge hits 13.5, not 14. With AC, lights, and wipers on, it will dip to 12.5. Doesn't seem to be anything wrong.

 

Ok, I guess its all good then. Thanks guys

 

Phew! I was afraid to ask this question. good stuff.

 

haha, I know what you mean...This thread can die now.