low voltage reading

[hernandez]

I would start up my mustang and my gauge would read above the the middle mark and the mustang would run great, but after a hour of stop and go and off and on, the meter starts to read low, and at night the lights are dim. but when i rev up the motor they get bright and the needle on the gauge is on the middle mark till i stop again and then it will drop and the lights go dim. i have a 130 g2 alternater, should i step up to the 200 amp g3 alternater.

 

[jadedinpa]

do you have underdrive pulleys?

did you upgrade the wiring when you installed the alt? or was it installed when you got the car?

 

[HISSIN50]

i have a 130 g2 alternater, should i step up to the 200 amp g3 alternater.

What is the elec connection like to supply 130 amps to the battery? The 2G uses a couple of charge wires, which should be insufficient to flow that amount of current. The 3G has a different power cable attachment.

How much do you have to rev the motor up to get the system out of a state of discharge? 100 RPM, 500 RPM, etc.

Good luck.

 

[hernandez]

i have u/d pullies but only on the crank and the water pump, and i rev it about 500 rpms , i was wanting to get to i higher amp so i can get rid of the low voltage reading on my gauge and to make the headlights staybright and not dim.

 

[sgarlic]

I'd just go ahead and swap in the 3g and the appropriate wiring. The 3g's are pretty easy to find these days, between eBay, junkyards, classifieds, etc.

A search for "jrichker" will reveal a quite informative and long post with all the info. you would need.