leds and my charging system.

Is your voltmeter connected across the battery (both +ve & -ve wires?) - it sounds like you are measuring dash etc voltages, else have have a ground drop. But yes - LEDs are far more efficient than incandescents. But whether they are legal etc.... (Technically they have probably not been approved for older vehicles....) And they can wash out in sunlight, or be too concentrated with little side spread etc. You will probably need a different flasher can if you change flasher/indicator bulbs. And it will confuse any blown-bulb sensor you have. But for the sake of efficiency, I'd hardly worry about it - what is the typical current/wattage of those bulbs, and how does that compare to your other loadings? Besides, if your voltmeter is not showing battery voltage dips below (say) 13.6V or 13V, then you alternator is doing fine.

Voltmeters should be connected across the battery - other places are subject to voltage drops etc. The alternator's target voltage of 13.8 - 14.4V (long term) is based on the battery's requirement. For internal lighting there shouldn't be any legal issues (assuming that's what you mean - ie, you are NOT replacing external lamps). LEDs "fade" in sunlight - you may not be able to tell that they are on - thatcan be a problems with brake & indicator lights. Older LED lamps had no side illumination - they were directed "straight out". That can be a problem for corner lenses. They can also be too bright (blinding) in a direct line.    You won't need a different flasher if you are not replacing external bulbs. Otherwise you need a flasher suited to your car that will operate with the lower LED load. I'd assume you know which bulbs you are replacing with LEDs, hence you can find out how many bulbs and what total wattage. EG - 10 x 3W dash illuminations lamps (30W); no 7W tail lamps or parking lamps etc. Say it's 50W. That's about 4A on a 70A alternator that might have an average output of (say) 40A. So is 4A in 40A worth it? How much for the bigger alternator (if you need it)? (Assume the LEDs take no power for the sake of argument. Otherwise assume 20mA per 3 LEDs unless you can find the LED-lamps actual draw. (LED-lamps may contain 15 LEDs as 5 parallel strings of 3 series LEDS. If the LEDs are 20mA, that means 5x20mA = 100mA = 0.1A per "bulb" (compared to say a 7W = 0.5A bulb) or 3 series LEDs (20mA) compared to a 3W bulb (250mA).    White LEDs are ok behind lenses. And colored LEDs are ok behind same-colored lenses. But you can't mix colors - eg - no green LED behind a red lens; and probably not a red LED with an amber lens and vice-versa.

Cool. Thanks for all the info!2013 Kia Rio -90a alternator

DDX470HD GTO14001 GTO1014D (x3)

Big3 in 1/0G

1/0G to GTO14001

H7 18 LED Bulb Red 2 PCs Features: Socket type: H7 Voltage: DC 12V Power: 2.7 Watt Light output: 60-70 Lumen Color temperature: 3000-4000K Light color: Red Length: 50mm Width: 25mm