Cat 287b charging problems

[ianjoub]

My 287b is not charging. I replaced the alternator and both battery cables. I cleaned to electrical connections when I did that. The battery has good voltage and load tests good.

Which wire in the 4 wire plug on the back of the alternator is the exciter wire (12v power/ trigger)? I want to test to see if the alt is being told to charge.

Thanks in advance.

 

[ianjoub]

Edit: 3 pin plug on the back of the alternator.

 

[heymccall]

Red...B+
Yellow... Ignition
Green...idiot light (I think)

 

[ianjoub]

Thanks, will check and report back.

 

[ianjoub]

I should have looked more closely:

I have 2 yellow and 1 green wires in that pigtail. One of the yellow wires has broken internally. I am trying to track down a new pigtail. I'll repair and report back. My guess is I bought an alternator and battery cables for nothing :shame:

 

[heymccall]

Similar to this plug

 

[Mark250]

hi guys are we talking the right alternator

 

[heymccall]

I dunno. He didn't give serial number, so I picked one.

 

[ianjoub]

View attachment 182868hi guys are we talking the right alternator
View attachment 182869

1st pic is correct

 

[ianjoub]

I dunno. He didn't give serial number, so I picked one.

You would think as long as I have been doing forums, I would include pertinent info like that, sorry.... Not by the machine to add that right now.

Thanks again for all the help!

 

[Mark250]

wire 403 hour meter
wire 308 power fro ignition switch
wire c444 wire to indicator lamp group
Mark

 

[ianjoub]

Thanks Mark.

 

[ianjoub]

Thanks again everyone. The power wire from the ignition was broken inside its rubber casing about 1/4 from the alternator plug. I jury rigged it for now and ordered the plug posted above. I am charging at 14.4v again.