You have a bad wire or connection to the battery. It may look ok, but it may be corroded inside. Id replace the battery, and clean the battery lugs even if they look ok. You only need a thin layer of corrosion to mess it up.
Do you know how to voltage drop automotive electrical circuit's using a DMM - digital multi-meter ? Checking main power feed to fuse box etc.... loose connection , bad positive feed cable etc ..
Do you know what wiring diagrams are ? Electrical distribution diagrams ?
Electric Testing Techniques You Need to Know
Free wiring diagrams here http://www.bbbind.com/free_tsb.html
Enter vehicle info. year , make , model an engine size. Under system click on electrical distribution then under subsystem click on power distribution . Click the search button then the blue link's . test the circuit's . Plus knowing how the systems work would be good . When you turn the key to start it send a low voltage signal to the BCM - body control module . The BCM sends a message to the PCM/ECM - engine computer to energize the starter relay . A lot of complex electronic's an electrical systems involved .
SOURCE: key ignition will not turn car all the way off...draining battery
I just did a post for this not long ago, but here we go again...
Try popping off the little round piece of plastic that is under your column. With your key in the ignition turn it back to the OFF position, or as close as you can get it, and take a small pointy object and stick it in the hole under your dash you should feel it push on something, and maybe hear a click, from there you should be able to completely turn your key to the OFF position.
I hope this helps you out.
SOURCE: abs and traction control light faults after a brake job. 2005 Pontiac grand prix
You have a bad sensor at one of the tires that need replacing that operates ABS and traction control. If you take it in to a shop it will run $130 but they can find which sensor is causing the problem. But if you do it you might have to replace all 4 sensors to make sure you got the right one. Every hard to diagnoses. Its better for the shop cause they can get electrical read outs for each sensor.
SOURCE: i changed the blower motor and resistor on my 2005
doesnt work on all speeds? ck the big purple wire at the blower motor, on high speed, it should have battery voltage, if it does, then check the black wire, it should have "0" volts (or ground it, see if it then works). If the purple wire does not have power then fuse #30 (30 amp) may be bad.If the black wire has more than "0" volts then the ground may be bad or the "blower motor control processor" =( resistor) is bad, or the ground for it is bad. the ground wire ends up at the cross beam behind radio. If you ground the black wire at the resistor, and it works, then you have a bad ground at the wire, behind the radio. Good Luck.
SOURCE: My 2005 Grand prix acts like it wants to start but doesnt half th
fuel pump , not enough pressure. check the pressure.
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