s13 electrical issues

[vds89]

Hi I have a 91 s13 coupe I recently changed my alternator because it was going out and also put in a new battery and everything was woking fine, it has now been about 2 weeks or so and today in the morning when I started my car it turned no problems and I parked it... but later on the day when i was leaving to work I tried starting my car and I notice there was no power at all.. my accesory lights where very low and all my car was doing was barely clicking over, so i had to jump it. I do not know what other answer can solve my question I have tried searching but yet nothing. I do not know what else to check? what to look for? any suggestions??

[vancouverbc]

battery terminals cleans and tight? alt belt tight? is your 75 amp alt fuse blown?