Hey everyone, I have been trying to banish the typical "low voltage/dim lights at idle" issue as of late and I have not had a lot of luck; wondering if anyone can offer any advice. This is on my '75 big block duster btw. I only have the problem when the car is at idle in gear with both the headlights and the heater on. Under these conditions, voltage is between 11-12 volts. With the lights/heater off voltage is about 13-13.5 at idle in gear and 14-14.5 volts at idle in neutral. Idle speed is 800 rpm in park/neutral, 600 rpm in gear. Also should mention the battery is in the trunk. What I have done: -New 60 amp alternator -Junkyard 90 amp 1990 dodge truck alternator (and 6 gauge jumper wire from alternator output to battery) -new voltage regulator -checked/cleaned grounds on voltage regulator and from battery to frame/body -checked voltage drop from alternator output to starter relay; voltage drop is 0 volts -checked resistance between alternator case and body of car; resistance is 600 ohms -checked resistance between negative battery terminal and car body, resistance is 300 ohms Not sure where to go from here; maybe install a relay for the headlights and the blower fan?