lights dim

Stang187 · February 2nd, 2010, 08:07 AM

when driving down the road and coming to a stop or slowing down with the rpm's droping, my headlights and dash board lights dim for a split second or two.
This happens one or two times while the rpm's are droping.

What would cause this?

goren813 · February 2nd, 2010, 09:40 AM

Alternator. Battery... Have them both checked at an auto store = free. Check battery terminals and cables for corrosion.

Codeman · February 2nd, 2010, 01:14 PM

Mine does it also, but mine is because I have UDPs. I run my headlights, foglights, with dash lights, gauge lights, gauges, cd player, with the mach speakers. Mine only dim when I am idling. So if you have UDPs that may be the problem. Otherwise, I would try cleaning battery cables first, that is the easiest. Then you can test your battery using a multimeter. Then if both are good, then you can google how to test your alternator.

February 2nd, 2010, 08:07 AM	#1
Stang187 Enthusiast 2004 Mustang GT Join Date: Jan 2007 Location: Florida Posts: 696 iTrader: 0 reviews	lights dim when driving down the road and coming to a stop or slowing down with the rpm's droping, my headlights and dash board lights dim for a split second or two. This happens one or two times while the rpm's are droping. What would cause this?

February 2nd, 2010, 09:40 AM	#2
goren813 MM's Official Lucifer '00 3.8L & '05 4.6L Join Date: Apr 2008 Location: Odessa, FL Posts: 3,620 iTrader: 0 reviews	Alternator. Battery... Have them both checked at an auto store = free. Check battery terminals and cables for corrosion. __________________ "Fast she goes...in the city of Overdose"

February 2nd, 2010, 01:14 PM	#3
Codeman Hardcore Enthusiast Join Date: Nov 2007 Location: North Dakota Posts: 2,933 iTrader: 1 reviews	Mine does it also, but mine is because I have UDPs. I run my headlights, foglights, with dash lights, gauge lights, gauges, cd player, with the mach speakers. Mine only dim when I am idling. So if you have UDPs that may be the problem. Otherwise, I would try cleaning battery cables first, that is the easiest. Then you can test your battery using a multimeter. Then if both are good, then you can google how to test your alternator. __________________ UDP, CAI, True Duals, LTs, 91 Tune from TT, 3.73 gears, Tlok,Windstar upper, GT TB, Ported lower, Comp 218/226 cam, FRPP C Springs, J&M LCA, Tokico Blue shocks and struts, and J&M Full Length Subframe Connectors

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