Did something VERY stupid ...Have i wrecked my Yaris?

[Stabilo]

Originally Posted by echo_hrs

The problem with sending the current through the negative terminals that there is no fused protection in that direction...

You may have fried your alternator or ECU, or it could be one of the larger fusible links in your fuseboxes...

Might want to first try hooking up a new battery to see if it's not just the battery that's dead...You could also get an inexpensive voltmeter to check if there is current...

Cheers

Cheers for your reply, i'll pick up a voltmeter later and try it. I should get about 10 volts across the terminals yes?

Fact that i was getting absolutely nothing when i turned the ignition had me thinking it wasnt the battery, i wasnt even getting warning lights or engine trying to kick in. nothing.

any other suggestions i should also try? thanks.