I had my alternater rebuilt and dash lights flash on and off

Sounds like your alternater, get a multimeter set it to volts start the car then check the battery is getting 14 or over volts from the alternater to the battery , if your getting less than that it's not putting enough volts back to the battery to run the car with good luck colin

wow if your battery is that old i would get a different one but you can have the battery and alternator tested for free at a auto parts store they can tell you if its junk or not but thats why your having them problems when your alternater spins it charges the battery if the battery is no good it wont hold a charge and you car will die now it the alternater is bad it will not keep the battery charged and your car will die.

There might be a short between the alternater and ground.
Check wiring
Disconnect battery and alternater wiring from the back of the alternater and with a multimeter check for continuity between the BAT stud on the back and the alternater housing.There shouldn't be any.

Just cause its a new alternator does mean it should work. I would check the charge when running cause it could just be a bad alternator.

mcdevito75 here, The replaced alternator should have a warrantee, bring it back to the shop that replaced it. If you did the work yourself and even if it's a rebuilt, you should still be able to exchange it. Some manufactureres recommend a new alternator and not rebuilt, plus if you"ve added any moe electrical items you"ll need a stromger alternator (higher amp).

check the charging rate the alternator is producing, if the performance is insufficient, it can cause other warning lights to come on as the system does not have sufficient power to run their self diagnostics within their operating parameters.

I believe the rebuilt one is not good too. If the battery light stays on it means that the system is not charging. Did you connect all the wires the same way

Surely sounds like an alternator problem. Check belt tightness . Most likely internal alternator fault. Hope this helps

Once the battery was placed backwards it may have sent a charge to the radio causing it to stop working, the alternater you should just try to either get it directly replaced same model..but if you want to try make sure all conectors are the same...other then that you can probly get a rebuilt one cheaper...rebuilt your current one will make sure its the same...and one major thing before you change anything make sure that the belt is on properly for the alternator and everything and just check if you are geting any charge from it

have the alternater checked for under charging or no charging at all