Strange Power Functions Issue

[jshuiting]

I bought a set from bricklink a while ago and tested out the electronics, only to find that they were acting really strange. 
I'll try to explain it is as clear as possible but i may mess up a bit.

So the set came with 4 motors, one of each kind, XL, L, M and Servo, and these all work perfectly fine on my own battery packs and recievers.
But now i hook them up to the included recievers, so XL on red, L on blue, but then only the XL motor works.
Now i'll switch them arround, but yet again it's only the XL motor that works, but now on the red channel.
The L motor does function correctly when hooked up to a different reciever or straight to a battery pack.

Further testing shows the XL motor works on all my recievers, both red and blue channels.
The L motor works on 2 out of 4 recievers but only on either red or blu side, not both sides on the same reciever
The Servo motor worked on none.
And the M motor worked on 3 out of 4, also on just one side per reciever, either red or blue.

And again all the motors work directly on the battery pack, or when hooked up to known good reciever.

So what's going on here? How does one motor work on a reciever, but another does not? Can i throw away the motors or are the recievers at fault here?
It's really frustrating because i am in the midst of making a deal with the seller aswell, but i can't without knowing exactly what's broken.

It's like the recievers are picky in which motors they want to actuate and which ones not, but how's that even possible?

 

[Hrafn]

That sounds really frustrating.

Is it a V1 or V2 receiver?

Have you tried stacking the leads, or using extension cables, to see if the issue is with the contacts?  For example, if the L motor only works on the red side of receiver A, attach the XL to the blue side of that receiver, then stack the L motor's connector on top of the XL motor's connector.

Take a good look at the motor connectors and the receivers - is there any sign of wear or rust on the contacts?

What happens if you connect a receiver to a PF-to-9V converter cable, then 9V-to-9V, then 9V-to-PF, then a motor?

[jshuiting]

They're all V1's, 2 from my 8043 which also used to work just fine before i swapped them out for V2's, and 2 from the 42030 i ordered.

When i stack the other motors on top of my XL motor's connector they all work aswell, but when you turn them arround they stop working again.

Connections are all clean aswell, no visible rust or oxidation.

Don't have a converter cable sadly.

[doug72]

Sounds like the connector pins on the PF RX red side need easing out a little bit.

Edited November 4, 2021 by Doug72

[Andman]

19 hours ago, Doug72 said:

Sounds like the connector pins on the PF RX red side need easing out a little bit.

@jshuiting, I had a similar issue. The above mentioned fix helped me. Just check the connector pins and bend them slightly outwards.

[jshuiting]

On 11/4/2021 at 4:49 PM, Doug72 said:

Sounds like the connector pins on the PF RX red side need easing out a little bit.

Thank you very much! 
I checked them out and 1 works like a charm now, the other still gives me some minor issues, maybe needs some more bending.

Really didn't expect such a easy fix btw, the XL motor working on all connections really threw me off, but i noticed it has a different connector with much wider contacts..