New MTH engine's speed is uncontrollable

Connect that harness and retest.  It looks to have orange wire just like the orange wire on your speed sensor.  Trains don't come with unused harness connectors as a general rule.

Volphin, I'd like to, but I can't find where to connect them.  I've looked...can't find an open female connector....

@Volphin posted:

Connect that harness and retest.  It looks to have orange wire just like the orange wire on your speed sensor.  Trains don't come with unused harness connectors as a general rule.

the 2 rail versions have the black coupler connectors unused. That's just an example. I've seen plenty of engines with extra connectors. You don't just randomly connect stuff!!!!!!!!!!

For the OP, it could be a wire touching ground or motor shell causing runaway action. Look carefully at the wiring especially where the wires attach to the trucks and go thru the frame area. Test for shorting at the board to the frame. Did you change any wire connections?

You may need a tech to test the board to help find the issue.

Many MTH locomotives come with a number of empty connectors inside the shell, I see that even more with the PS/3 models.

@gunrunnerjohn posted:

Many MTH locomotives come with a number of empty connectors inside the shell, I see that even more with the PS/3 models.

Thanks.  

@Engineer-Joe posted:

the 2 rail versions have the black coupler connectors unused. That's just an example. I've seen plenty of engines with extra connectors. You don't just randomly connect stuff!!!!!!!!!!

For the OP, it could be a wire touching ground or motor shell causing runaway action. Look carefully at the wiring especially where the wires attach to the trucks and go thru the frame area. Test for shorting at the board to the frame. Did you change any wire connections?

You may need a tech to test the board to help find the issue.

I did not change any wire connections.  I did remove three connectors that lead to the front lights, number boards, headlight and ditch lights. That's it.  I'm coning to the same conclusion. I think it may have to go to a tech.  Thanks.

Just remember, this is what many shops base their rates on.

or ......

@gunrunnerjohn posted:

Just remember, this is what many shops base their rates on

@gunrunnerjohn posted:

Just remember, this is what many shops base their rates on.

@gunrunnerjohn posted:

Just remember, this is what many shops base their rates on.

 

 Any credit for almost fixing itself yourself?  Any credit for confirming something is wrong?  Any credit for breaking it so you have to take to a shop?

@Richie C. posted:

or ......

I'll like John's rates a bit better....

You guys left one out....$100.00 + shipping if nothing is wrong.  That's what Mike Regan charged when i sent him my Big Boy because I was convinced the blow-down didn't work.... turned out, it did.  Can't believe I'm admitting this in public.

@Engineer-Joe posted:

the 2 rail versions have the black coupler connectors unused. That's just an example. I've seen plenty of engines with extra connectors. You don't just randomly connect stuff!!!!!!!!!!

For the OP, it could be a wire touching ground or motor shell causing runaway action. Look carefully at the wiring especially where the wires attach to the trucks and go thru the frame area. Test for shorting at the board to the frame. Did you change any wire connections?

You may need a tech to test the board to help find the issue.

Well based on the image provided it looked like a good course of action.  However, if the harnesses were of different types, or obviously don't go together, then NO, you wouldn't.  Don't ya just love diagnostics over wire?  LOL

Seems like a serious design flaw to leave unneeded connectors laying about the harness, not to mention the costs associated with production.  Oh well, back my Lionel repairs!  HAHAHA

No one is a mind reader when it comes to these situations. Personally, I think too many features are packed into many of the new engines available today'. The technology is great, but one small error in the manufacturing process can create these nightmares. 

so true.