Car's electrical completely dies at first crank. Battery ...

Q: Car's electrical completely dies at first crank. Battery is brand new and has been tested at 505 amps.

asked by on September 25, 2017

I got into my car this AM. automatic locks unlocked. car dash lights came on. radio came on. Went to crank..All electrics shut down. No lights no dash nothing. tried to jumps start the car.... still no lights no dash nothing. Took the battery cables off. tried it again. got lights got dash..go to crank it. BAM all electrics are off and back at square one. Every time i take the cables off and put it back the same thing. Tested the battery label says 490amps. tested it at 505 amps. Battery is 100% completely charged and 4 days old.

My car has 107000 miles.
My car has an automatic transmission.

Hello, thank you for writing in. Electrical issues like this can be tricky. The first thing you should try is starting the vehicle with another battery. Pull a known good battery from another vehicle, and try it in your car just to be sure. If your battery really is fine (which doesn’t seem to be the case), then you have another component sucking amperage from the battery when your key is in the crank/start position. Either way, the starter is NOT getting the power it needs to turn over the heavy engine and get it started. You will want to then look into the alternator, the alternator circuit, the ignition switch, the fuse box, and the fuse box power supply and ground connections. Make sure no electronics are on. This is including light bulbs, radios, climate control, plug in chargers, and any other accessories. There may be a short in one of those systems that is active only when the car is running. Only further testing will tell. You will want a voltmeter and possibly wiring diagrams to help during this process. For more help, contact our service department to schedule an appointment.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Running really rough, not starting usually. Battery light came on. Car overheated. Headlights turn off when I put the high beams on.

Hi there. With the information given, it sounds like you accidentally put 3 bottles of Gas Heet (water / antifreeze remover) into the gas tank. There is to be only 1 bottle of Gas Heet to a full fuel tank...

Transmission not shifting into second gear

It could be that your transmission is in "limp home" mode. If the controller has sensed a problem with second gear, like slippage, it may skip second gear to enable you to drive the car. Scanning the car for trouble...

My car is juddering between 20 and 30 miles per hour And high revving after 40. Your issue or question fully describe your

What you are describing may be a result of a faulty speed sensor, potentially low transmission fluid or a even a faulty transmission control solenoid. As your vehicle travels down the road, the computer analyzes data being sent by vehicle...

Related articles

What Essentials Do I Need to Keep in My Car?
Many Many of us think of “car essentials” as those items we always keep stocked in our center consoles and door pockets, like chapstick, napkins, and phone chargers. But there are a few other items you shouldn’t leave home without,...
What Is Key-Off Battery Drain?
Many Many things in your car continue to work even after your vehicle is turned off – radio presets, security alarms, emissions computers and clocks are just a few. They continue to draw power from your car battery, and the...
How to Use an iPod in a Toyota Prius
Gone Gone are the days of toting around cassette tapes or CDs in cases to keep tunes on hand when you're on the go. Today, we have playlists on our portable devices like iPods. When you don't have the latest...