[ACUF]

Hi Everyone,

Any specific advice on putting a new alternator in my U900?

-any pointers, etc, and things I may overlook.

Thanks,

-ACUF

 

[ACUF]

Speaking of the tach, do not turn the stud that the tach wire hooks to on the alternator even a tiny bit or you will break off the wire inside the alternator and your tach wont work until you open up the alternator and solder the wire back on.

These alternators are as basic as they can be. A few diodes and a couple of bearings and some brushes, that's it. Good idea to grease the bearings when you split one open.

-OK,

The tach works currently, but the alternator doesn't seem to be charging my battery, and if I run the lights, etc, the battery will be dead when restarting. The battery is new. The alternator looks pretty beat, so I assumed it was a bad alternator. How do you get the tach wire off without turning the post?
Thank you,

-ACUF

 

[ACUF]

Yes, the charging light is on when I turn the key on.. So what does this indicate if the battery is new and doesn't keep a good charge when running lights, auxillary electrical components?

 

[ACUF]

Its as simple as a voltage check across the battery when the engine is off,and then when it's running to confirm whether the alternator is actually charging,not charging or over-charging.

-So it should be sending 14V to the battery when running, 12V when not running?

 

[ACUF]

OK, I can check all of those things. My volt meter may need replacing, but when I locate it I will try a test with that too. Thank you.

-ACUF

 

[ACUF]

So, The red light stays on when running on the 123 setting, but its dim, but when in the 0 position its bright red when running. the tach is working. the terminals are on tight, but will take them off and clean them.

-ACUF

 

[ACUF]

Yeah, I will start looking around for the volt meter. It will be helpful for this test, but it sounds like even if the alternator wasn't broken, now is. Luckily I have a new Bosch to replace it with, and Man, I will never turn the key to the 0 position when running!!

So what actually happens to the voltage, when the engine is on, but the ignition is off? -you say fry.. but what really happens to the electrics?

Thank you all for the feedback. Very helpful.

-ACUF

 

[ACUF]

Well, thank you all for the feedback on the alternator and my misunderstandings of overloading it. So, would running it in the off postion also fry lights, and other electrical things? or would the fuse system stop that?

 

[ACUF]

Also, how are these spikes created? and, if the key was in the off position, then now worries about currents running through the trucks electrics, right?

 

[ACUF]

Very excellent feedback, as usual.

Thanks Great Collective Unimind.

I will keep the updates coming.

-ACUF