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My 01 blazer was needing a jump about every start bought a new battery ran fine for 2 days. Then had a loud whining from under the hood, i pulled over turned it off then had no power at all. Disconnected the battery hooked back up and it started. Let her run for a few mins. put in drive and stalled couldn't her it to stay running finally stayed but every stop sign/light it would stall. i would have to put in neutral and rev up to keep running. put a new alternator in it still did it. next day ran fine. The following day it wouldn't start again disconnected and recooked the battery tried to start all the dash lights were flashing took out the key and they stayed on for about 5 secs flashing. Put the key backwards and it hums. Was giving a trick to turn key forward slightly for exactly 10 mins not sure it help but it did start but rpms drop in gear and occasional stopping it still stalls. Any help would be awesome.
lets start with the simple and cheep stuff...do you have a digital volt meter... if you don't.. they can be had for 7 bucks to 25 bucks.. a lot of parts stores have these from innova for about 16 bucks..harbor freight stores have these for about 20 buckseither will last you for decades.. next.... i would take a digital volt meter...set it to 20 volts DC scale...start the engine and turn on the headlights..1. test between the positive and the negative battery posts. 14.1 to 14.8 volts is expected.2. test between the negative battery post and the engine block. 0.04 volts is expected..3. test between the negative battery post and the body... 0.02 volts is expected..4. test between the Engine block and the body.. 0.02 volts is expected.if you get 0.00 on the last 3 tests.. change the meter setting to 2 volts DC scale.. and retest.. the last 3...this test takes about 2 minutes...post your results by test number..if you get more than the 0.04 or 0.02 volts on the display... you have a bad ground between those parts..why do this test.... bad grounds will stop any new car in its tracks...why... electrons flow from Negative to positive... if you loose a ground.. or it becomes intermittent.. you won't have any power for that circuit... just like a table light when the plug falls part way out of the wall... the light will go out.. also i have fixed a LOT of cars lately with that 2 minute test... some hot water and a stainless steel wire toothbrush ...finding the ground connections.. removing them from where they are bolted down after counting how many wires are on each one.. wire brushing both sides of the ring terminals... wire brushing the back side of the nut.. wire brushing the mounting pad... washing with HOT water.. putting them back on.. and counting to verify the number of wires is the same...the verifying with the same test again...THIS IS JUST THE FIRST TEST ... there are more to come... please post results by number...