Which battery terminal do you reconnect first?
“Positive first, then negative. When disconnecting the cables from the old battery, disconnect the negative first, then the positive. Connect the new battery in the reverse order, positive then negative.”
What happens if connected battery backwards?
When a car battery is connected backward, a fuse designed to protect vehicle electronics should blow. If your vehicle doesn’t have a fuse (almost all cars do) designed for this purpose, you will send electrical current backward through systems in your car, including ECU, transmission control unit, and more.
Which battery cable do you disconnect to reset the computer?
When removing cables, remove negative first, then positive. If you just want to reset the ECU, removing only negative is good enough. When installing cables, install positive first, then negative. It’s a real tight fit, but if you can find it and disconnect it, leave it disconnected for 30 seconds.
How do you disconnect auto battery?
Disconnect the battery then unscrew the brackets holding it in its tray. Car batteries are heavy so lift the battery up, out of its tray with care. Use diluted baking soda mixture with old toothbrush to brush the tray and connectors. Do not put the new battery before they dry.
How do you disconnect a car battery?
How to Disconnect Your Vehicle’s Battery Step 1: Locate the Battery Step 2: Locate the Positive and Negative Terminals Step 3: Find the Right Wrenches Step 4: Unbolt the Cables Step 5: Remove the Battery Hold-Down Clamp If You’re Storing Your Vehicle
How do you install a battery cut off switch?
Step 1: Locate the battery in your vehicle. Step 2: Remove the negative battery cable. Step 3: Install the battery cutoff switch. Step 4: Connect the negative terminal to the cutoff switch. Step 5: Activate the switch. Step 6: Test the battery switch.
What is a battery master disconnect switch?
Battery Master Disconnect Switches. Master Disconnect Switches designed for 12 VDC vehicles (Truck, Automotive, Marine, RV) to disconnect all circuitry to reduce possibility of theft and accidental electrical fires. Available in keyed or lever versions, with or without indexing pins, and various sizes of terminal studs.