Head Lights surge

TenMore · #1 (**permalink**) 02-11-2011, 10:26 AM

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

ford diesel · #2 (**permalink**) 02-11-2011, 11:03 AM

alternaor might be getting a bit tired.

TenMore · #3 (**permalink**) 02-12-2011, 07:16 AM

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.

bfr44 · #4 (**permalink**) 02-14-2011, 09:46 AM

Its the glow plugs. They stay on a lot longer the the light on your dash, and it depends on how cold it is.

TenMore · #5 (**permalink**) 02-14-2011, 10:32 AM

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

Mista Miller · #6 (**permalink**) 03-26-2011, 08:56 AM

Could be headlight switch and wiring at back of switch, if alt checks out. Mine got hot and melted a while back.

TenMore · #7 (**permalink**) 03-26-2011, 01:40 PM

Ill check that but .......it seems to be in time with the motor at idle under power it dosnt do it

belz · #8 (**permalink**) 03-26-2011, 02:38 PM

I have to agree. It sounds more like the alt isn't charging enough at idle. Any update?

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Remove Advertisements Sponsored Links
Powerstroke.org Advertisement