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You are watching: Why do my headlights dim when i hit the brakes

1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and also prevalent difficulties for the Series I and also II L67 (all supercharged models 92-99) Including Olds 88"s, Olds LSS"s and also Buick LesabresPlease usage General Chat for non-mechanical worries, and Performance and also Brainstorming for renovations.
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Why are my headlights dimming when braking?


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Hi everybody. Due to the fact that this is a totally various problem, I chose it finest to make a brand-new thread.This trouble has actually been plaguing me for a pair years, but Im simply currently encouraged to deal with it.The issue: My headlights dim (at night obviously) as soon as the heater is on and I hit the brakes. I deserve to check out it on the road as the light output goes dvery own. Also, my blinkers tend to sluggish dvery own at stoplights via my foot on the brake. This can be at night and throughout the day.What Ive tried:-cleaned the battery terminal connections-cleaned alternator connections-cleaned power wire from battery to the relay spilgrimage on the firewall-cleaned the ground on the passenger fender behind the battery-cleaned the two grounds on the motorists fender behind the PCM-cleaned and also repaired a crappy link on the alternator bracket under the coil packs-cleaned the ground in the trunk on the drivers side wheel well-inspected rear blinker bulbs, very same in both sides (check out a heavy duty one on one side would certainly screw up the system)-inspected all rear light sockets for corrosion, none found, applied dielectric grease to store them that way-inspected front bulbs, same bulbs on both sides-inspected light sockets, all clean and applied dielectric grease to store them that way-pack tested battery, 650 cca on the label, at 575cca-fill tested alternator, passed-cut out the ground bus on the chauffeurs floorboard and also relinked it all. It was very corroded and the windows and fuel pump wouldn"t work, that"* just how I knew to inspect that bastard.What is next? It"* clear that there is a power drain once the brakes are applied, heater running, and also all lights on. What confprovides me is the flasher lights in the dash slow up sometimes, however not all times.Help!!! What am I missing??