Lights dimming
Joined: Sep 2002
Posts: 51,241
Likes: 20
From: NV
Rep Power: 812 
Re: Lights dimming
exactly, considering the a/c system and fan use close to 500w of power. it never hurts to check the battery if you think its getting old. usually failures happen gradually and you will notice slower cranking as the first sign.
If you think a good mechanic is expensive, try hiring a bad one
Joined: Dec 2011
Posts: 32,017
Likes: 256
From: Midwest. Aiming about mid-chest
Rep Power: 518 Re: Lights dimming
2 fans and a clutch is probably consuming somewhere between 20 and 25 amps,
Quite a sudden load because they all turn on at the same time when the compressor cycles.
(In addition to the inside blower, which may be up to 15 amps, depending on what it is set at)....
The lights do dim noticeably.
Normal.
Ever hit all 4 power window switches all at the same time, after the windows stopped moving? The headlights will dim then too. Still normal.
Quite a sudden load because they all turn on at the same time when the compressor cycles.
(In addition to the inside blower, which may be up to 15 amps, depending on what it is set at)....
The lights do dim noticeably.
Normal.
Ever hit all 4 power window switches all at the same time, after the windows stopped moving? The headlights will dim then too. Still normal.
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