Why do my lights get brighter all the sudden? - Diesel Forum - TheDieselStop.com
1999-2007 General Questions General questions related to 1999-2007 Super Duty trucks. If it doesn't fit the other categories, post it here. Gas engine discussion that pertains to all models is allowed. Specific gas engine questions should use the Gas Engines forum.

 
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post #1 of 7 (permalink) Old 12-27-2013, 05:32 PM Thread Starter
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Why do my lights get brighter all the sudden?

Have had my 2000 F250 7.3 CC 4wd for about a year. Just recently (several times) I've noticed that after I've started up and driven only a few hundred yards my headlights and dash lights get brighter all of a sudden. Haven't done any diagnostics yet, but maybe this is a known problem?
John
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post #2 of 7 (permalink) Old 12-27-2013, 05:46 PM
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It is normal. The glow plugs will stay on for up to 2 minutes and during that time the alternator has a hard time keeping up with the amperage draw from them. When they shut off that is when the lights will get brighter. If you also watch the volt gauge on the dash you will notice that it will stay quite low for the same amount of time.

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post #3 of 7 (permalink) Old 12-27-2013, 05:56 PM Thread Starter
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Thanks bugman. That makes me feel better. Now iI wonder why I don't recall seeing it until recently. That makes me feel worse again... maybe I'm getting old...
Perhaps it's more noticeable in cold weather?
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post #4 of 7 (permalink) Old 12-27-2013, 06:00 PM
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The cold weather might affect it - First, the glow plugs stay on longer based on oil temperature at start up. Second, the batteries are going to be weaker in cold weather and the load of the glow plugs probably pulls them further down. It theoretically could be an early warning sign your batteries are going south.

2003 F-250 XLT Crew Cab 7.3L, Chrome BigTex Grille Guard, Quad pillar - 3 ISSPRO gauges (trans, pyro, boost) and DP-Tuner F6; Roush fuel pressure / temperature / oil pressure gauges, Ford Severe Duty AIS, 31 row 6.0 transmission cooler, ScanGauge II, Marinco mod, Walker BTM, Full Force Stage 1 injectors

IF MY BODY IS EVER FOUND ON A JOGGING TRAIL JUST KNOW THAT I WAS MURDERED SOMEWHERE ELSE AND DUMPED THERE
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post #5 of 7 (permalink) Old 12-28-2013, 07:48 AM
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Might suggest your batteries are getting weak. Hard to know what is going on w/o a set of gauges. Might be a good time to invest in a scan guage 2 or an edge insight. They plug into the computer port and tell you all temps, volts and some pressures. Well worth the money in my opinion.
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post #6 of 7 (permalink) Old 12-30-2013, 06:48 PM Thread Starter
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Not surprisingly, I'm not familiar with the "scan guage 2 or an edge insight". Where does one get them?
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post #7 of 7 (permalink) Old 12-30-2013, 07:44 PM
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Linear-Logic/ScanGaugeII with trip data computer, real-time display of operating conditions and scan tool (SG2) | ScanGauge | AutoZone.com

2003 F-250 XLT Crew Cab 7.3L, Chrome BigTex Grille Guard, Quad pillar - 3 ISSPRO gauges (trans, pyro, boost) and DP-Tuner F6; Roush fuel pressure / temperature / oil pressure gauges, Ford Severe Duty AIS, 31 row 6.0 transmission cooler, ScanGauge II, Marinco mod, Walker BTM, Full Force Stage 1 injectors

IF MY BODY IS EVER FOUND ON A JOGGING TRAIL JUST KNOW THAT I WAS MURDERED SOMEWHERE ELSE AND DUMPED THERE
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