Can't get my Mohawk to run after rewiring

In picture #1 you have a black wire on the #2 brush...Does this have continuity with the #2 brush terminal on the AC Commander board. As a matter of fact, check all or your wires for continuity, from the AC Commander terminals to the motor terminals. You may have something cross wired. Also, make sure you have a good ground between the chassis and your Capacitor grounds. Is your caps in backwards? You need to observe the polarity on the caps. I also see in your #3 picture, that you grounded one side of the AC input to the tender chassis. Are you getting a good continuity check through the chassis to the outside rails? Put a volt meter on the 2 AC terminals on the AC Commander board with the power on, You should have 18 volts there. When I did my conversion I changed the forward tender truck so I had power coming in on the tender.

I'm at work now but if you would like I can post up a picture of my engine for reference. I've done quite a bit of work to my engine though....    Here's a link to my conversions,  https://ogrforum.com/...-6-18011-mods?page=1

Its a pretty straight forward install. the only issue is making sure you get through the tether correctly.

Post up what you find.

Good luck.

Yes as mentioned I have check continuity and everything checks out correct. None of the wires are crossed. Again, I can't get the motor to run at all for some reason period is really baffling . Any other suggestions would be much appreciated.

Thank you again, Jerry

For some reason I am not getting all my messages. Could you please email me your responses at

Jba435@gmail.com

Much thanks, Jerry 

I see bare wire on your 2 brush and field wire on the Commander. But I'm wondering... Do you have wire insulation under the AC terminals? Do you have 18 volts there with track power applied?

Jerry, not to ask a silly question, but just to help trouble shoot.

Is your antenna properly connected? Or is the issue prior to that.

Again, not to sound simplistic, but have you tried simply powering the motor with a couple leads/alligator clips to see if it runs?

Hopefully Jayhawk can get you those pics of his conversion so you can compare.

Jerry A posted:

Also checked power from the center pick up of the engine to the negative ground on the AC Commander module and I get correct voltage from the Transformer. 

Is that correct ???

Found your problem!    You need to add a wire from your right side Capacitor ground to the upper right field terminal. Your field isn't grounded. It's an incomplete circuit.

My blue wire (AC COM)  goes to the motor brush on the right, white wire.  **Note** My brush wires in the picture are backwards on the AC COMM board.*** 

My green wire (center, AC COM) goes to the center field terminal on the motor, black wire.

My yellow wire (AC COM) goes to the motor brush on the left, yellow wire.   **Note** My brush wires in the picture are backwards on the AC COMM board.***

I didn't find this out about my brush wires until after I took these photos.

Red and Black wires (AC COM) go to my tender rear truck assembly for track power.

The order is, left to right:     Red, Black, Yellow, Green, Blue.  Sorry for the confusion.

Notice in the second and third photos. There is a black wire that connects the right field terminal to the right screw. This is where the original ground wire was, that locked out the forward and reverse functions by moving the black plug from inside the cab.

Hope this helps...Let us know.....

This is what you are after. The ground is at the bottom of the drawing.

Thank you very much for all the replies. I appreciate it very much and can't wait to try what you guys are suggesting. This thing is driving me nuts.

Again as usual thank you very very very much for your replies, Jerry

Jayhawks,

I added the wire you suggested and after weeks and weeks of aggravation talking to several people including the owner of e e r your wire was the answer. Thank you, thank you, thank you! If there's any kind of problem you can depend on ogr to solve it.

Best, Jerry 

Jerry A posted:

Jayhawks,

I added the wire you suggested and after weeks and weeks of aggravation talking to several people including the owner of e e r your wire was the answer. Thank you, thank you, thank you! If there's any kind of problem you can depend on ogr to solve it.

Best, Jerry 

 

Jerry, So glad that was the problem. Congrats! Now, go enjoy it!