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Head Lights surge

2K views 7 replies 5 participants last post by  belz 
#1 ·
00 f250 7.3 left for work today 0500 am 30 degrees. While coasting down road (not under power) noticed headlights were surging stepped on pedal they stopped let off they started surging again. Noticed truck at idle at work had the same surge in motor nothin major in either light or motor just a slight variation in brightnees and rpm's any Ideas? It was real quick maybe 1/2 to a second inbetween pulses both in lights and motors :dunno: Thanks in advance Tenmore
 
#3 ·
Alt. is less than a year old. Thought that myself but could be a bad one guess Ill go get it checked. Dont know if its cause I didnt let truck warm at all, started it and left it was cold and sluggish. When Ive done that in past head lights are on the dimmer side for about the first mile or so than they brighten up. Ive never had the surge in the lights or motor though.
 
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