Changed the starter and put in a vats bypass new key still won't start any ideas

 

What does it do? Starter engage at all? What was it doing before the new starter install? Year?

 

I wish you newbies will fill out your profile. IF someone is nearby, they might be able to lend a hand physically or lend you some tools you don't have. Also we know what you are working on. What car? What year?

You might also start with what problem you are trying on solve before you put these parts in. That can give us a clue where to look.

 

If you are pretty sure that the starter is hooked up correctly - you can try jumping power to the small start terminal on the starter- that basically bypasses the Ignition switch and the VATS system, and should make the starter engage and crank the engine (I'd suggest doing so through a fused lead - with at least a 20 Amp fuse).

If jumping power to that terminal causes the engine to crank - you now need to figure out why you are not getting power to that terminal when you turn the key to start. It may be the VATS system, or something else - but start by doing a search on VATS in the C4 Tech section of the forum for a thread that will describe how the system works, and how you can tell if it's prohibiting a start attempt.

If jumping power directly to the start terminal on the starter doesn't make the engine crank over - you have one (or more) of the following issues:

1. A battery that is too weak to crank the engine over.
2. A defective starter.
3. A poor connection on the 12 Volt supply to the starter.
4. A poor ground connection between the starter and the battery.

A cheap VOM and a set of booster cables can be used to troubleshoot from there. Remember - the starter is a 12 Volt moor with an actuating solenoid - nothing more.

 

5. A problem with the starter enable relay (operated by TDS or VATS).