No crank no start when i put test light on starter wire under load the light comes on but very dim

Hello, how's the 12 volt battery doing? Has it been tested? Is it fully charged? Is it able to sustain a load? This is where I would start before getting into where you are headed with your testing. https://repairpal.com/auto-repair-near-me Click the link or call us at 877-913-1554. We'll gladly find you a certified RepairPal shop in your area.