Kind of a rookie mistake but today I left my lights on, on my 91 Mazda Miata went to jump start it with a battery charger but accidentally attached the positive and negative cables on the wrong terminals(both cables are black give me a tiny bit of slack) only for a couple seconds once I realized I s…

Trial and error, try the cheapest things first. New battery try one?

Hm I just figured if the EC didn’t work nothing electrical on the car would work as well, also it was a jump pack

The problem with connecting any jumper backwards is, you run the amps thru the circuits before they encounter the fuses. So an electrical component may fry first before the fuse. So, yes. Tester

[image] Tester: The problem with connecting any jumper backwards is, you run the amps thru the circuits before they encounter the fuses. So an electrical component may fry first before the fuse. Current cannot flow through a component until there is a path from one polarity to the other. So …

Electrons flow from negative to positive.

OP could have a dead battery with an internal fault, or bad connections. Either could keep a jump or a battery charger from working. The reversed hookup might have harmed nothing.

[image] What Happens If Jumper Cables Are Reversed on a Battery? Almost all drivers know that a car with a dead battery can be started by jumping it from a car with a charged battery. Automotive batteries are designed to produce the high electrical current required to start the engine. Thi…

So the Main fuse 80Amp blew nothing else, Replaced it and it was back up and running. Thank you guys for the help!

[image] Demian30.leonardo_152314: So the Main fuse 80Amp blew nothing else, Replaced it and it was back up and running. Thank you guys for the help! That’s great news. You dodged a bullet.

Can jump starting a car with a battery charger burn the ECU?

Maintenance/Repairs

NYBo May 22, 2019, 12:58am 2

Yes, the EC can be fried by reverse polarity. But there should be a fuse protecting it.

The lights have nothing to do with the ECU.

Are you using a battery charger or a jump pack?

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Can jump starting a car with a battery charger burn the ECU?

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