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Discussion Starter #1
I've had the problem where my blower and headlights will have diminished power for a second, as if the alternator is failing, so I bought one of those cig. lighter diagnostic tools that tests the alternator output and battery charge, and the levels were good, however when I would shift, and even intermittently while idling at a light, the diag. would show power cutting out. This is when the headlights are noticeably dimming, and my blower dims for a moment. The car is a 2009 Fortwo, a 450 I believe, and has 145k on it. I bet the belt needs changing even though I looked at it from craning my neck up from under the car, but I don't hear it making noise, and I haven't had any console errors or anything else out of the ordinary.

I read a long time ago about a tension pulley or something like that which kicks in when shifting, and alternator brushes or bushings potentially being the culprit.
 

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Discussion Starter #3
Thank you. I've fixed some easy things on this car already, and hope to keep it going for a long time. Hopefully this community will help, and I can be an SME.
 
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