what alternator do I get to replace the old one

I had AZ test, it past. Was mando 70 amp. Still not charging battery . gonna get from Napa now. Should I get the same 70 amp or go with a bigger amp.also will the bigger amp work and fit?

if the Mando 70 amp was the original i would go back with that one.if your battery is dead,then you will have to charge it with a battery charger first.the alternator will not do it.it only maintains the charge on the battery,it don't/won't charge the battery..................... Alternator - Remfd - StandardAlternator - Remfd - Standard, 70 Amp Part Number: RAY 2139198 Product Line: NAPA Power Premium Plus IMPORTANT INFO: w/ Mando Alternator,w/ 4 Groove Pulley,w/ 70 Amp Alternator $170.10 /ea Reserve & Save $189.00 /ea Regular Price

Thanks a lot you've been very helpful.

your welcome.good luck.make sure all your connections are clean,free of corrosion,tight,including grounds.check alt. plug and harness for cut/frayed wires.check everything...post results,whatever they may be,good i hope!