I’ve got a 99 v6 with manual transmission. It’s not starting, kills the odometer and gauges when you try to start it.
ive replaced the ignition switch, vats is bypassed, starter and ignition relays swapped with fan relays.
I’m thinking the only things left are the clutch safety switch, or the starter?
anything else I’m missing or need to check?

 

Battery or terminals? Sometimes it's that simple.

 

Battery and all connections look good. I forgot to include that info, it was the first thing I checked.

 

Externally charge battery first. Then, measure starting voltage across posts and if below 9.5 volts, battery bad as in can't hold a charge, or not being charged enough.
Upon start-up, battery may ave as high as 14.6 volts across posts, meaning charging system is good.

 

Battery is not the issue, I’ve tested it.

 

Old school trick - any fully charged battery WILL start an engine with lights on.
If lights go out, battery not charged or cannot supply power for the load given, aka, starter motor.
If starter kicks in, feel battery cables - if hot, then bad starter, assuming the solenoid kicks in the starter drive.

 

The headlights stay on while trying to start. It’s just the odometer and some of the gauge lights that are going out while turning the key I’ve tested the battery with a battery tester, and hooked a 2000 amp starting booster pack to the car, Battery is definitely not the issue. I’ll have to see if I can get someone to help me see if the starter is getting power

 

You might jumper out the clutch safety switch.

 

You need to define what you mean by "not starting". It sounds like you mean the starter is not turning the engine. "Not starting" can also mean the engine is turned by the starter but the engine won't run by itself.