I have a 2003 Chevy trailblazer I have a couple problems. First the car sometimes does not start. I can start it a few times a day and go places and then later on it will not start. All lights on dash will come on you can hear relays and the fuel pump. But when you turn it over notthing no sound at all. The battery is good. I replaced the ignition switch that did not help. Then I started noticing light on that should be. When you put the car in gear sometimes the right turn singal in the dash will light up and the go away when you put it back in park. I also noticed last night that in the rear when you turn the right blinker on 2 lights blinks sometimes together and sometimes it goes top to middle light taking in turns blinking. I had it put on a scanner and the only thing that stood out was when the car would not start I was in park but the scanner said I was in third then when the car finnaly start 2 hours later wen went through all gears p,r,n,d,3,2,1. And this is how it read. P,r,n,d,3,1 all said I was in gear 1. Then for 2cn it said I was in gear 2.

SOURCE: 2004 A4 1.8T Brake Lights Remain On After Car Is Parked

Sounds like your brake light switch is on its way out. Its a simple fix and a cheap part. It will need to be done immediately as not only can the lights staying on drain your battery but it can also cause lack of power and not put the brake lights on when braking. The switch is operated by the pedal itself and requires the drivers underdash trim to be removed. With this off the switch can be accessed and replaced. If you can get a vehicle technician to fit it, do so, as they are quite fragile and new switches can become useless if fitted incorrectly. Good luck

Dennis Gaebel

• 36 Answers
• Posted on Feb 18, 2009

SOURCE: Engine will not crank intermitantly

Crank sensor can translate heat. Not allowing restart after the turbo heat radiates in the area. Try a wad of aluminum foil in front of the crank sensor(on the block behind the turbo) . It protects it from heat and its a cheep test. If this works you can make a better sheild or leave the foil.

SOURCE: fuel pump relay working intermitently.

is the relay ok? i think what you are hearing could be 2 relays at the same time. i think the fuel relay works with another aluminium looking one. there's usually a few of them that are identical so you can swop to check.

SOURCE: 1993 Nissan Maxima, Non-Start

Hello, I would assume this is a starter problem. You can go to Autozone and get a free diagnostic of your electrical system for free and tell you if your starter, alternator, battery is bad and/or if you have any trouble codes present in your system. I would also check your battery connections to see if they are tight and I would also check and see if your starter cables are tight as well. I hope this helps you and Good Luck!

SOURCE: 2006 GMC ENVOY starter not turning over, with ignition switch on.

the ignition switch is a problem with these vehicles so that would be my first call.