not charging

I have a 2016 48 volt EZGO golf cart. Problem is it wont charge. When i plug it in the charger which is a Delta q SC48 the light will blink red and green which signals a fault. This problem hasn't been an issue until we had 2 usb ports installed. The golf cart still drives normally but just...

I could really use some help. I'm confused. My 1996 Club Car DS 48 Volt with F/W lever is due for a charge as it is running a little sluggish. The golf cart runs but the battery charger doesn't turn on to charge the batteries. The Lester charger will not start since I can't get any reading at...