Hi all. I've been trying to diagnose a problem and was wondering if anyone here could help. My 92 Bonneville will not start. It won't turnover or anything. I have supplied power to the starter selenoid and it works (it engages the starter and cranks the motor) but I haven't been able to find the source of the problem in the ignition wiring. I have tested the ignition and the electricity flows to the coresponding yellow wire while the key is in the start position. From there I tested for power at the Park/Neutral switch which only lets the car start in park or neutral and there is no power when the ignition switch is in start. I have ensured both ignition fuses in the engine compartment are good and there is no indication that the vats system is acting up (security light blinking, etc.). The only other part in my manual that I can check is the starter enabler relay and I can't find it. I have bypassed it, but when I do the car starts and immediately dies. So if someone could provide me with the location of the starter enabler relay (pictures would be so awesome) that would be great and any suggestions would be greatly appreciated.

I meant to say I tested for power before the power entered the park/neutral switch and there was none. So essentially the power isn't even reaching the park/neutral switch.

If the starter enable relay is where it is on the 94, it'* no fun to get to. It'* behind the instrument cluster. I had to pull the dash to get to it.

Go to your starter and check the voltage on the small wire while someone turns the ignition key. Be very careful because this is high current. This small wire is the signal that comes from the ignition module signaling the starter to crank. It will only go to 12 V if the ignition is functioning and the key passes VATS.

Might be worthwhile to check your coolant level and make sure it hasn't dropped. If it has dropped (or has been dropping) it'* possible your engine is hydrolocked. I say this because I went through the exact process you listed, and it turned out to be the problem. You can try turning it over manually with a wrench on the harmonic balancer.

From the new old guy….

Would be a good idea (search this) to clean and verify battery connections and cables. If voltage is low because of poor contact on POS or NEG engine cable or ground may not turn over (may be corrosion up inside cables you can not see). In my day poor connections would give you a weak engine turn over but it would turn over – now, poor connections could give you NO turn over below specified voltage. Could be other sensors or relays but battery cables are something that need to be right no matter what. Maybe a good starting point. You said that you jumped the starter and it turned over but you probably have bypassed the battery cables to do that. Being a 92 if the cables are stock they may be that old? Was the measured voltage in specs?

Just a thought