I started a new thread as this is a new issue and i guessed if i posted in the other thread it might get missed.
I mentioned previously that the battery needed charging every night as during the day it was going flat.
I was all set to go and buy a new battery this morning, as the car had been idle for 6 months and suspicion was that the battery was probably on its way out,
However, Last night whilst driving I noticed something strange. the voltmeter which started at 12volts started dropping rapaidly until when I pulled up in front of my house it was reading around 7 or 8 volts.
Now I am no genius at cars but I am thinking, "Well, how can the alternator suddenly pump out less volts?" then it struck me that the voltmeter lights up even when the motor isn't running, so what it is actually showing me isnt the voltage coming off the alternator, but the voltage on the system, it also struck me as odd that when i pressed the gas pedal the voltmeter didnt rise or fall but stayed constant.
So this morning, with these nagging problems in my head, I decided to stop at the jeep garage before i went to buy a battery and order a thermostat and whilst there I asked if there was an easy way to test if the alternator was working.
They said, drop a voltmeter on the battery terminals, make a note of the output (in my case it was 12.4 volts, it had been on charge all night) and then start the motor and take a reading again, the voltage should be around 14 volts (mine read 11.5 volts).
So running the engine is actually draining the engine by -1 volt almost, whereas it should be +1 or +2 volts.
I switched the engine off reread the reading (now 12.2 volts) and restarted the engine to be sure (now 11.4 volts +-).
So pretty conclusive that the alternator isnt doing its job.
My question now is, before I replace the alternator is there a way to test the voltage actually coming out of it, I am hoping there may be a wiring fault somewhere that can be fixed with a little elbow grease and some patience, but before I do that I need to know that the alternator itself is actually giving out current.
Anyone know which terminal it is I should drop the voltmeter onto on the alternator and what expected voltage range will be coming off it?
Lastly, seperate problem, Road lamps, on the CJ there are two headlights, the main circular ones and the smaller round ones underneath, the smaller ones arent actually wired in I noticed, I also noticed that the bigger headlamps have been converted to dual filament, I noticed because it was night and a small blue light came on near the 80kmph mark on the speedo, and I thought, hmm, that looks like a full beam light to me, and indeed I was dazzling everyone as i drove, could i find the switch to turn it off, no chance, I drove along for half a mile, went over a pothole and the full beam turned themselves off, I think I have a long weekend looking at wiring diagrams ahead