[stuartm]

so i went to start my o6 obxt today and it was flat dead no lights what so ever so i asked my brother in law to boot me from his car thinking this wasent a big deal, long story short he hooked his end up backwards which made the ob car alarm go off almost instantly, i hauled the cables off when i realized what he did and reversed them, the car did start but now the alternator has a noticeable noise to it, did the reverse polarity fry it? the car runs and has no warning light yet but it still defiantly sound wrong. better the alternator than the ecu i guess.....

 

[subiesailor]

Battery is probably very unhealthy - no lights or blown fuses chances are your charging system is fine but the battery being damaged could cause the charging system to run hard and that could be what your hearing.

 

[stuartm]

blown 100a main fuse after all