02 Jetta Starting Problem

We have an 02 VW Jetta GLS on our dealership lot. Most mornings it won't start--the battery might click, might not. Once we've jumped it, it's good for the day. We replaced the battery. Suggestions?

We have an 02 VW Jetta GLS on our dealership lot. Most mornings it won't start--the battery might click, might not. Once we've jumped it, it's good for the day. We replaced the battery. Suggestions?

alternator might be the problem, you can charge the battery all you want, the alternator isnt going to hold the charge and you will be running solely on the battery.