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you may have blown all of the modules on the vehicle whats does it do now? most vehicle electronics have reverse polarity protection but without the answer that whats its doing now i cant help the alternator will be the 1st thing to be blown
That sort of thing can badly damage management system, relays, melts connection, fuses. There is a fuse for the computer, check your manual. But get it diagnosed.
Try resetting the CPU program as it may be corrupted from reverse polarity. Have the ECM checked out as reversed polarity tends to damage them internally.
I would be re-checking the battery. Make sure that when you have it tested they do a "load test". Sometimes a battery can seem good, but be bad when there is a large load placed on it. This test will reveal if that is the case.
It could also be a starter problem, and it is possible (but unlikely) that it is a wiring problem.
to get this out of the way you can get the code from the manufacturer. Contacting Honda at there website is the quickest way. Business hours are Monday through Friday, 6:00 a.m. to 5:00 p.m., Pacific Time, or try this page here https://radio-navicode.honda.com/
outside the US: Honda Canada Customer Service (888) 946-6329
Honda Motor Europe LTD. TOLL-FREE 01753 590590
Honda de Mexico Servicio a Clientes 01 800 368 8500
sorry to say , get a voltmeter and go through the wiring starting at the fuse box and follow on from there, that includes the ground circuits, its time consuming but revesing polarity can cause untold damage
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