PT425 PTO Switch Replacement - How to wire up replacement switch of different brand?

[smartguyz]

Hi TBN friends!

My PTO Switch failed and I am in the middle of replacing it. (Ordered and received replacement from Power-Trac)
The problem is that I can't tell how I am supposed to wire up the replacement. Here's why:

1. Both old and new switches have 6 connections.
2. Old switch and new switch are two different brands, and the labeling on the switch connections (i.e., labels for 1, 2, etc. are completely different between the two switches)
3. Therefore, I don't know how to wire the switches. Normally, I would ohm out the old switch, but the old one is dead and I can't check it.
4. How can I proceed with the replacement?

Thanks so much!

-Rob

 

[ponytug]

Photos might help...

In general, DPDT switches (six terminals, effectively a "left" switch, and a right switch") switch the middle between the two ends.

All the best, Peter

 

[MossRoad]

How many wires were connected to the original switch?

 

[MossRoad]

Photos might help...

In general, DPDT switches (six terminals, effectively a "left" switch, and a right switch") switch the middle between the two ends.

All the best, Peter

Yep. I'm wondering if it has wires that prevent it from starting the engine if engaged?

By flipping it, you'd think it's just an on/off switch, but with 6 poles but no middle click, is it a DPDT, or is it an X?

 

[MossRoad]

But like you said, it should be:

 

[ponytug]

Yep. I'm wondering if it has wires that prevent it from starting the engine if engaged?

By flipping it, you'd think it's just an on/off switch, but with 6 poles but no middle click, is it a DPDT, or is it an X?

I don't know an "X", but DPDT switches come in two flavors; one has a stop in the middle (ON-OFF-ON), but I think that the PTO switch has no stop in the middle (ON-ON DPDT), or at least mine does.

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All the best,

Peter

 

[MossRoad]

I don't know an "X", but DPDT switches come in two flavors; one has a stop in the middle (ON-OFF-ON), but I think that the PTO switch has no stop in the middle (ON-ON DPDT), or at least mine does.

Sockets & Plugs

For reliable connection of a truck and trailer on commercial vehicles or caravans, we offer several types of trailer connector sockets and plugs for 12 V and 24 V systems. Available in 2-, 3-, 7-, 13- or 15-pole variations, our trailer plugs and sockets conform to applicable ISO standards, and...

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All the best,

Peter

Yep, I believe you are correct. What I was getting at with the X comment was a wiring scenario, not the construction of the switch.

 

[MossRoad]

Rob, do you have an OHM meter?

 

[m5040]

Since they changed the manufacturer, why not just ask Terry for a wiring dia?

 

[smartguyz]

You guys are the best, thank you for the thoughtful and quick responses!

My problem has been solved: I managed to get in touch with Terry today (right before he left for vacation) and he said "All you need to know is that there is a groove on the 'bottom' of the switch as it sits in the dash. That indicates the 'off' position of the switch, when the handle of the switch points towards that groove, it means the switch is in the OFF position. Just make sure the groove is positioned on the bottom side of the dash and connect all the wires exactly the same as they are on the original". The 'groove' or 'slot' is on the threaded portion of the switch (The part that holds the switch to the dash.)

I followed his advice and everything is running properly again.

I do NOT know the purpose of the various wires (which as an engineer bothers me a bit), but I am happy to have my faithful PT back in business.

Thanks again Team PT.

-Rob

 

[smartguyz]

Rob, do you have an OHM meter?

YES, I have several... and an oscilloscope.

I would normally have checked the original switch, but it was physically damaged (by me, while swapping out the throttle control) due to bowden cable failure.

Thanks again,

Rob

 

[MossRoad]

YES, I have several... and an oscilloscope.

I would normally have checked the original switch, but it was physically damaged (by me, while swapping out the throttle control) due to bowden cable failure.

Thanks again,

Rob

On that note, I'm on my 2nd set of throttle/choke cables. I'm tempted to switch to the engine mounted shorty cables.

Did you find the spacers on the underside of the dash for the right cable? I couldn't figure out why they put them there, so I left them off, only to smash my fingers the next time the steering wheel came around. They're there to lower the right cable handle to provide clearance from the underside of the wheel.

 

[ponytug]

@smartguyz I never realized that those items were called Bowden cables. Thanks! Live and learn, or at least read TBN and learn.

All the best, Peter

 

[MossRoad]

@smartguyz I never realized that those items were called Bowden cables. Thanks! Live and learn, or at least read TBN and learn.

All the best, Peter

Me neither. I looked them up, yesterday too.

 

[cqaigy2]

Ditto!

 

[cqaigy2]

Function of PTO switch. Two functions, activate a solenoid to switch on/off the hydraulic flow and interrupt starting circuit?

 

[MossRoad]

Function of PTO switch. Two functions, activate a solenoid to switch on/off the hydraulic flow and interrupt starting circuit?

That's the way I understand it. You can't start it if the PTO switch is in the ON position.

I know this for a fact, as I replaced a starter on mine before realizing the problem with it not starting was I bumped the PTO switch.

Now have a spare starter.

 

[smartguyz]

On that note, I'm on my 2nd set of throttle/choke cables. I'm tempted to switch to the engine mounted shorty cables.

Did you find the spacers on the underside of the dash for the right cable? I couldn't figure out why they put them there, so I left them off, only to smash my fingers the next time the steering wheel came around. They're there to lower the right cable handle to provide clearance from the underside of the wheel.

Hi MossRoad!

No, I haven't replaced the choke bowden cable yet. I did notice the spacers on the original set. The throttle cable had failed (bound up) and I just needed to get my trust PT back up and running. I was pretty upset with myself for mangling the PTO switch while I was trying to fix the bowden cable. I ordered both cables (They are identical).

Thanks again for the quick responses, you folks are the BEST!

-Rob

 

[cqaigy2]

I maybe getting close to replacing the cables on my 422, and now that i know they're called bowden cables, it should be easier to find a replacement.

 

[MossRoad]

I maybe getting close to replacing the cables on my 422, and now that i know they're called bowden cables, it should be easier to find a replacement.

I got mine directly from PowerTrac and they weren't that expensive, as I recall. So compare shopping.