2000 Mercury Sable No-Crank
this post is long, but it is detailed as i'm having some real issues here.
I'm having some real issues here, I'll start by giving a bit of background.
Hate on me if you must, but wal-mart gave me a different spec of battery than my old one. Considering this was night-time and in the middle of a snow-storm, and I was trying to get to work I thought little of changing out the battery. I put the new one in and turns out it was backwards. It was only in for a few seconds.
Fast forward a week or two.
I ended up replacing the alternator because a load test alerted me to a "bad voltage regulator". I still ended up having to troubleshoot charging issues, and my park lights, horn, radio, and door locks, didn't work. The ABS light was on as well.
After changing the alternator and all the blown fuses I was still having issues with I ended up with the following problems:
Charging light on, still testing a bad voltage regulator
Park lights setting/autolamp setting blowing fuse 27 (autolamp circuit)
Intermittent inside door locks not functioning (keypad still worked)
I did a drop test and checked all the wires in the charging system and found the master fuse (175A megafuse) to be the issue. I replaced it and one other fuse that had blown in the battery junction box and I was left with the following symptoms:
Autolamp/Park lamp setting blowing fuse 27
Intermittent inside door locks function (this would change based on disconnecting and reconnecting the battery at times).
3-5 second delay in the engine starting from when I turned the ignition to the "start" position.
Over the next couple weeks I studied the wiring diagrams and decided to do some electrical troubleshooting. I traced the autolamp circuitry problem to the switch and have ordered a new one to replace it that will be here soon. By jumping the two pins (pin 31 and 34) on connector 270b I was able to get my park lamps to function without blowing the fuse. Essentially I bypassed the switch (which I'm not so certain was the smartest thing to do at the moment). I hooked a 15A toggle up to give me intermittent function of lights and left it set to the OFF position and tried to start the car. At this point the car would not crank and I had the following issues:
The High/Lo indicator was blinking on and off as if it was getting varied amounts of voltage.
None of the Cluster Indicator lights turned on except the "flashing" High/Lo indicator and the anti-left. The PATs light was functioning as it should.
I disconnected my battery and let it sit over night. The next morning I drove it home (I was at a friend's garage) and I had the following symptoms:
No break lights/turn signals/park lights
No cluster lights
No gauge functions except the fuel gauge
When I went to start the car about an hour after getting home to go to school it would not crank. I traced the voltage back and found the starter to be working by jumping the solenoid and that the solenoid wasn't getting voltage. Now here are the symptoms I'm left with after checking for blown fuses:
Car will not crank
I am able to turn the ignition into the "start" position in any gear. I have tried to crank the car in multiple gears and it has not made any difference. The radio does turn off when I try the ignition to the "start" position.
None of the lights work except the headlights (High/Lo and normal)
Fuse 27 still blows with the autolamp circuit but I expect the new switch to correct this issue.
No indicator lights on the cluster when I turn the key to the "run" position
I'm not sure if this is a TRS issue or an ignition switch issue. I do hear the relay kick over when I try to start the ignition. One thing I do know is I have a lot of issues going on here but if I can divide and conquor I can start tackling some of these problems, hopefully someone on here can give some guidance. I can provide wiring diagrams if necessary.