99 ssei, DC Power weakness - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 03-20-2007, 05:23 PM   #1
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Default 99 ssei, DC Power weakness

At night when lights, radio, fog lights are on, and I hit on the brakes the lights dimm just a bit. Like is loosing DC power, or needs more amparage to hold everything. I recently replaced the brushes on the alternator, thinking that would do it. Is it the battery, about to go? I had this issue for years, and I still have the same battery.

What controls the DC to everything in the vehicle.
thanx
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Old 03-20-2007, 07:50 PM   #2
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When the ignition switch is placed in the RUN position, voltage is supplied to generator terminal L by the PCM, turning on the regulator. The generator'* voltage regulator controls current to the rotor, thereby controlling the output voltage. The rotor current is proportional to the electrical pulse width supplied by the regulator. When the engine is started, the regulator senses generator rotation by detecting AC voltage at the stator through an internal wire. Once the engine is running, the regulator varies the field current by controlling the pulse width. This regulates the generator output voltage for proper battery charging and electrical system operation. The generator F terminal is connected internally to the voltage regulator and externally to the PCM. The PCM monitors the field voltage on the generator F terminal.
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Old 03-20-2007, 10:05 PM   #3
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I have the same issue in my 97, just thought it was something that was normal and I had to deal with. When hitting the brakes the lights dim for a sec.
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Old 03-21-2007, 05:19 PM   #4
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So, how do I fixed the problem...? What needs to be replaced so it outputs 100% voltage?
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Old 03-21-2007, 05:28 PM   #5
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First thing you do is pull your battery cables, remove the rubber boots and check for corrosion at all ends of all cables. Clean all the connections and reassemble. Then test.

Most of the electrical issues we see here are remedied with this simple process that takes about an hour. The B'villes are very picky about power and always show us the problems.
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Old 03-21-2007, 05:47 PM   #6
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got it i'll get on it
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