What happens if you put battery cables on backwards?
When the jumper cables are incorrectly connected, the polarity of the electrical system on the vehicle with the dead battery will be reversed for a few seconds. This can irreparably damage many of the sensitive electronic components that are common on today’s vehicles, such as on-board computers and electronic sensors.
What if both wires are black?
You will get a reading if one wire is hot and the other isn’t. However, if both wires are hot, the reading will be zero. However, if you need to rewire a light switch or a plug socket, you may occasionally come across two black wires. It’s essential that you determine which black wire is hot before proceeding.
Can a reverse polarity fuse blow a fuse?
My father-in-law recently bought a Hyundai Genesis that has an internal switch preventing reverse polarity hookups from damaging the electronics. Hopefully more manufacturers will do this to prevent what is a very common mistake. You can see into these big fuses and they don’t appear blown.
What happens when you hook up a car battery backwards?
When they put installed the battery, they hooked it up backwards and blew the main fuse. When the main fuse was replaced and I was driving off I noticed that the charging light was on, and the radio/clock was not working. Taking it back, they confirmed that the alternator was dead and replaced it (with me paying for it).
What happens when jumper cables are reversed on a battery?
Damage to the Batteries. Connecting the positive terminal of each battery to the negative terminal of the other battery will result in a huge surge of electrical current between the two batteries.
What should I do if my alternator blew up?
You need to go to the shop manager or store manager for resolution. You should not have to pay for any parts or labor for the new alternator. Hooking up the battery incorrectly blew the alternator. As to other problems, radio etc., you need to get the manager to agree that these were affected as well.