Mechanic put in a new battery, started fine, however right after while slowing down driving it would idle down to around 500 rpm.. took it back and the check the alternator... drove out of town for work now i try to start it and i have no lights on the dash, no gauges work, and nothing when i try to start it
Check all your battery connections. Maybe not a good connection since your key doesn't turn on warning lights and gauges. See if your headlights work to verify a good battery connection.
Any chance you blew fuses? Like a maxi fuse for the ignition switch? Or for older vehicles that used a fusible link to connect battery power with the ignition switch. Keep diagnosing until you get power to the ignition switch (warning lights and gauges working with key ON).
Any chance your battery is totally discharged? Was the alternator working good when tested? If alternator quits working, engine and all electricals will run off the battery for a time until it is totally depleted, then will stall and won't have enough juice to even turn any lights on. Check battery voltage with a multi meter or voltmeter. A good, fully charged battery will show 12.6 volts. If under 12 volts, it may or may not have enough juice to start, but lights will still work some, though maybe very dim. .
SOURCE: 2004 Ford Ranger Low Idle
I figured out what was going on. supposedly on ford rangers the Idle Air Control Valve (IAC Valve) goes bad. i got a trouble code looked it up and sure enough it is the IAC Valve. Under 100 bucks for the part
SOURCE: car will not start
It is most likely your alternator, Your alternator is responsible for charging your battery, Which if your battery is fine, is the likely cause of your issue, HOWEVER, Be sure to check your battery cables for damage, Make sure the clamps are tightly connected to your battery, If they have corrosion (White fluffy stuff) on them, Take them off and clean them (BLACK (Negative) First, Then take the RED (Positive) off and clean that too, Then put them back on in the reverse order.) with a stiff wire brush, Also be sure to clean the terminals on the battery.
SOURCE: 97 honda accord wont start clicking noises
clean your battery terminals parobally have corrision on them
SOURCE: 2002 Chevy s10 electrical problems
Not to well versed on the S-10 electrical system but I would take a look at the voltage regulator.
It sounds like there is a malfunction that charges your battery sometimes but shorts out the alternator other times. Try having it tested or replace it
WD-40 will not do the trick for cleaning your terminals. WD-40 was developed during the 2nd WW to combat moisture in radio equipment in the South Pacific. WD stands for water displacement and the 40 is for formula #40. To clean the terminals you must disconnect them and use an abrasive such as emery cloth to remove the corrosion. They should be brite and shiny when you put them back together. I always cote mine wit dei-electric grease before re-assembly
SOURCE: 02 Sienna, idling issue, new battery, alternator tested good
check for vacume leaks listen for a hissing sound if you here one but cant pin point it you can use a spray bottle of gas of can of ether both very flamable so be gentle and spray around the sound when the engine revs up theres your leak thats where i would start
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