The contact owns a 2005 Chevrolet Trailblazer. While driving approximately 50 mph, the contact heard a loud noise outside the vehicle. The transmission began to slip and there were no warning indicators illuminated on the instrument panel. The vehicle was taken to an independent mechanic on two separate occasions for inspection. The technician stated that the alternator failed. The warranty expired on the vehicle and the manufacturer is in the process of being notified. The vehicle is able to be driven and has not been repaired. The VIN was unknown. The failure mileage was 72,000 and current mileage was 76,000.

- Staunton, VA, USA

Late evening, I was driving down the freeway in a snow storm and suddenly my engine power dropped significantly. I could not go over 10 mph and barely made it up the off ramp to be stranded 3 1/2 hours away from home. I spent a total of $700 to get the alternator and I-pulley replaced. The old part was not returned or I would have had to pay an additional $50.

- Sylvan Lake, MI, USA

Alternator failed.

- Hyattsville, MD, USA

My alternator went bad, having problems with my lights getting brighter for a second during acceleration and then it goes back to normal. Winding noise coming from my alternator started at 36,175 miles right after the warranty ends.

- Bayshore, NY, USA

Alternator bearing started going out at 37,000 miles.

- Leawood, KS, USA

Bought the 2005 Trailblazer new, have taken it to have the flashing lights fixed on 3 occasions, but they could not duplicate the problem, so they could not fix the problem. Then while on a trip the switch went out, and was replaced at a dealer where the vehicle was not purchased, the lights quit flashing. Now the alternator has gone out, only 48,000 miles.

- Sanford, TX, USA

On numerous occasions, I have had issues with the headlights dimming upon slowing from highway speeds. I was told that this was normal function, and could not be reproduced by the dealer. Today, I was informed by another dealer that the altenator bearings have gone bad, and the altenator needs to be replaced. Vehicle has 57K miles.

- Eau Claire, WI, USA

Intermittent electrical problem...when driving, lights dim, electric gauge goes down several notches below normal reading and then up several notches past normal reading. This has been an ongoing problem, getting worse, with the latest incident having occurred today, Nov. 11, 2006.

- Trevor, WI, USA

I have brought my vechicle to the dealership for service on three seprate ocasions for the following condition: The voltage fluctuates between 10 and 15 volts, causing the headlights and instrument panel to go dim, then bright again. The dealership was unable to diagnose or reproduce the problem. Today 04/06/2005 the dealership stated they contacted GM, and stated that this was normal. This is not normal! I have never driven a vechicle in which headlights going dim, then bright normal. It is almost as if the lights are flashing at times. The dealership stated that there are tsbs stating that this is normal. This to me creates an unsafe driving environment. I found the following statement on GM techlink: www.gmtechlink.com/images/issues/cnt_mo/tlcme.html some customers may comment that their instrument panel voltmeter is fluctuating between 12 and 14 volts on their new 2005 model year light duty full size pickup/utility vehicle. For 2005 model year, light duty full size pickups and utilities, are equipped with a new regulated voltage control (rvc) system, covered in the September 2004 techlink. The rvc system allows changes to vehicle voltage, up or down, under various scenarios. Battery state of charge and the vehicle?S present electrical needs are only two of numerous conditions taken into account. This will cause the voltmeter to fluctuate between 12 and 14 volts. By comparison, conventional systems usually maintain a more consistent reading of 14 volts. This fluctuation with the rvc system is normal system operation and no repairs should be attempted.

- Leander, TX, USA