Idles low(600) when ac/heat is on and headlights dim. recently replaced alternator(was doing this before replacement). voltage is at 15 with lights on but drops to 13-12 when blower at full blast. when i lower the blower speed the voltage rises. also when i speed up rpms. when it is idling low say at a stop light you can hear the blower speed slow down then pick up when you drive off.( rpm increase)
Fix the idle speed to 850-900 rpm
check the alternator and voltage regulator as the voltage should read 14.5-14.8 volts dc at 1000rpm or higher regardless of what is running
have it bench tested by an accredited auto electrician
SOURCE: 2004 Ford Ranger Low Idle
I figured out what was going on. supposedly on ford rangers the Idle Air Control Valve (IAC Valve) goes bad. i got a trouble code looked it up and sure enough it is the IAC Valve. Under 100 bucks for the part
SOURCE: gmc sonoma voltage fluxuation & headlights dim at night
I would still have the alternator chk. sounds to me that the internal regulator or a diod is going bad.
SOURCE: lights and fan blower motor speed decreases when idle steady
vachum modultor motor is leaking.
SOURCE: Dim Headlights. 2001 Jeep
seems like a power issue, you could try buying a new battery or take it to an autozone and have your voltage checked battery should be putting out near 13 volts.
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