I decided to replace the alternator as the car had developed a horrible intermittent whine. I tried changing the belts, realigning the crank & power steering pulley but no difference. I suspect that the noise is the alternator itself (bushings etc). I quickly found that the alternator in the car was non standard (why am I not surprised!). A quick check of the numbers on the unit shows that it is an internally regulated Bosch unit.
I had ordered a new Alternator & Power Steering pump in 2020. When the alternator arrived I thought I had screwed up as it was packaged (and sold) as a 1 wire externally regulated unit. It sat in the shed for 4 months and I after doing a bit more research I ordered a new 1 wire internally regulated alternator. Imagine my surprise that when it turned up it looked exactly the same as the original one. On checking CJ Pony Parts part description I found a note saying they had incorrectly named the first unit I had purchased and it was actually what I wanted. So I now have two 1 wire internally regulated alternators! (no point sending it back as it would cost a fortune in postage)
The nice shiny new alternator is shown above. It fit perfectly and belt alignment is pretty much perfect out of the box. All that pain I have suffered due to the old unit!
I have now received the cable I have been waiting for and will hook it up to the connector on the back of the alternator directly to the battery. I hope that this work will remove the horrible whine.
Update : Well, I hooked the new alternator up and went for a drive. The same intermittent whine happened at the same time/place.
So now I’ve replaced belts, power steering pump, alternator and haven’t found the noise. A quick bit of research is now pointing me towards wheel bearings or speedo cable (yes, even the speedo cable can make a horrible noise in these cars)
I’m taking this personally now…..