Head Lights surge - Ford Powerstroke Diesel Forum
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Old 02-11-2011, 11:26 AM
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Head Lights surge

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 Thanks in advance Tenmore
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Old 02-11-2011, 12:03 PM
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alternaor might be getting a bit tired.
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Old 02-12-2011, 08:16 AM
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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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Old 02-14-2011, 10:46 AM
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Its the glow plugs. They stay on a lot longer the the light on your dash, and it depends on how cold it is.
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Old 02-14-2011, 11:32 AM
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bfr44 The glow plugs will cause my head light to surge like that? they were dimming about the same rate as a turn signal flashes
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Old 03-26-2011, 09:56 AM
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Could be headlight switch and wiring at back of switch, if alt checks out. Mine got hot and melted a while back.
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Old 03-26-2011, 02:40 PM
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Ill check that but .......it seems to be in time with the motor at idle under power it dosnt do it
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Old 03-26-2011, 03:38 PM
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I have to agree. It sounds more like the alt isn't charging enough at idle. Any update?
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