My 2003 v6 magna tl/ls battery icon keeps appearing on dashboard whilst driving. Had new battery put in, replaced drive belts, full service incl spark plugs. Alternator was tested at the time of buying new battery. Sometimes the antilock icons appear and on 2 occassions the aircon switched off . (Hoping the new drive belts will fix that) can you advise as to what you think is wrong ? Cheers