Head lights dims out
old post day, Geo underdogs.
is engine running, seem yes, pretend yes...
high and low beams dim (means weak not low or high beams)
dim bulbs. all elements, left and right sides?
well first is battery voltage
use a $10 walfart DMM meter., (set to volts)
13.3. to 15vdc is the voltage running, on a hot engine rpm is 700+
RPM not 400. so, if all that is good, the ALTERNATOR IS doing its job, yes, the regulator is inside the alternators and changes voltage , by SENSING batteries needs, and sensing driver added loads, (accessories)
so if battery voltage is good, the what is it,
well that is easy head lamp failure
got DRL do you have the infamous, and pesky DRL daylight running lamps as the law requirements in CANADA,
next time say DRL or canada, ok?
if all lamps are dim on the HL,
the the ground to them are bad.
there are 4 bulbs , 2 high 2 low, all for dim is bad ground there.
the Headlamp relay sends 12vdc to all 4bulbs, and most read 12v or more.
the lamps are grounded by the HL combo switch on THIS car
the ground must be good to this switch 0v, HL onl.
or the ground is bad. a white/black wire called G200
if 12vdc is weak (low) to HL then the relay or wire to it are bad.
if the ground is not 0v, (no more than 0.5vdc) then the ground is bad. if the ground is good, then the HL switch is bad and if bad gets hot and smell... (melting plastic in side)
there is the full answer, sans DRL> (a longer story that)
Feb 24, 2014 |
1991 Geo Prizm