dash,head lamps dim

[aircargoo]

k...ive noticed that in drive at a stop light....dash,headlites,radio....dimms a little.

truck charges fine...even charged battery few months ago.

if i TAP gas pedal...it brightens normal...like driving(moving). i mean ...just "tap"...it barely while at a full stop in drive it dimms slightly..

any suggestions people? 97 4.6

 

[walnuts4x4]

my old 97 f150 did the exact same thing after I change the altenator... never did figure out why... hope someone gives you the answer would be cool to know what it might have been....

 

[aircargoo]

yea...doesnt seem to affect things.....had truck over 2 yrs....alter. HAD 2b changed b4 i owned it (134,000).

it dimms pretty much thou...u can hear affect in heater blower tone(sound) on high when its turned on.

if ildle was a HAAAIR up high....think it would do it.

 

[gjhanson2]

The alternator might not have the same output as stock, or might be running a different size pulley wheel (underdrive). I know a programmer can bump up the idle, but I think a shop might be able to do it for you too.

 

[outkast]

mine does it too...as does my Lincoln...honestly I think its normal...as long as its not too bad.

 

[Cousin Eddie]

It's normal....the stock alternators, do the job, but barely(many aftermarket alternators will do the same thing) . if you reduce the load(led tail lamps) it should get better.

 

[blacklow]

i have the answer for them damn dimming lights lol. ford has really bad ground wires, just change the wire that goes from the battery to the alternater to a 0 guage wire. and do the same for the ground wire from the battery to the truck body to a 0 guage wire. that will fix all the dimming lights. i did it to mine and never did it anymore. hope that helps

 

[Cousin Eddie]

good tip....

 

[97_edition]

Good to know. I will have to do this. I noticed my headlights dimming when my ABS is pumping my brakes for me.