MTH FP-59PH1 issue

When you have it running do a DCS signal strength test and see what you get.   G

I have one that acted like that and it was a pinched wire that was starting to short on the chassis when the body was on.

GGG,  I found a purple wire bare under plastic motor cover at front of engine all other wires fine. I believe they control front lighting as they go to a green molex connector.

 

I pulled a large molex connector on main PCB board and apparently that is the set of wires that allows the start up in conventional only as engine was silent and unpowered with it disconnected.

 

it will be the first long connector just behind the smoke unit with either 2-3 smaller molex connectors behind that.

 

so what does that connectors wires go to?

 

thanks for any help,

St Paul

GGG,  no spring connectors on this engine purple wire is okay put some tape over bare spot.

yes the connector I refer to is a 12 pin connector from left to right looking from front of engine where ditch lights are the wires are red-grey-2-bluesame pin-black-tan-white-yellow- blue 2 greens same pin-orange-2 brown same pin- last wire is tan

 

i attached a picture full size of the connector I am referring to hope it helps you relate to  my issue.

 

thanks St Paul

 

 

Brown double is normally Purple and that is the PV.  Where does the attached end of the broken Purple wire go? G

GGG, no broken purple wire anywhere.

Only purple wire had a small bare spot where sheathing had a small hole but wire still attached where it connects to a green mole wire and is for lights at front of engine.
And what does PV mean?

GGG, I will trace purple wire for lights to see where it connects at both ends meaning pub and what light up front

Positive voltage.  Ok, I mistook bare as broken.  So now that it is insulated. Does it still not pick up the DCS signal?  How does it run conventionally?  G

GGG. even with that bare wire insulated still not seeing the dcs signal but if I push startup on remote the sounds go lower where I had them and will work as a command engine after that.

 

it will also run conventional as well.  is there a specific circuit on the mother board that deals only with the watchdog signal? 

There are a few inductors that can be damaged from over current.  When you say lower volume, can you get max vol out or does the engine sounds drop to about half after start up on their own?  If so, you have an issue that needs to be resolved and it is best to get to a tech to test/repair.

 

G

Ggg,  yes I can get max volume that actually is what it is when power applied.
Well repairs will wait have family issues more urgent sounds like one of those components you mentioned in last post.

Way over my skills. thank you for the help.

St Paul

As G points out, the speaker wires are on the large 12-pin connector so that's why it is silent when removed...conventional or command.  This engine apparently has smoke.  Does it start smoking on command-mode powerup with the 12-pin connector removed?

 

As long as the 4-pin molex smoke connector is hooked up, you should be able to tell if the engine missed the watchdog and started up (assuming smoke was ON when you last shut it down).  This way you can rule out any wiring problems on the 12-pin large connector as the root cause of missing the watchdog signal when power is applied in DCS command mode.

 

Just an idea...