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KM4 will not fire


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#1 willytg25

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Posted 22 February 2014 - 06:06 PM

Hey, this has been a problem that I've put aside for a year now, and am finally getting around to fixing. My KM4 will not fire or make any sound/indication of functioning when fired. I suspect it's the motor, as I had a number of issues with it previously. I don't think it could be anything else, the wires look good and the fuse isn't broken; i'll check again to make sure. One day while playing, it was working fine and then all of a sudden just stopped functioning, no indication of the battery running out, just nothing. Any help would be appreciated.

I do not have an extra motor to use to test it, just fyi.

#2 Larry

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Posted 23 February 2014 - 05:49 AM

Try another battery first. Second remove the fuse and jump across the opening with a piece of wire (sometimes the fuse burns in a spot you cant see),  if it arcs when trying to jump it check wiring. Leave wire in place of fuse for now (can wrap fuse in foil while testing if easier).  Next remove the motor and hook it up outside of the gun, see if it works, if not tap on it with something lightly. Start there.

Edited by Larry, 23 February 2014 - 05:54 AM.


#3 hellcat

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Posted 23 February 2014 - 12:09 PM

Sounds like a loose motor wire/connector.

#4 gcw360

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Posted 23 February 2014 - 03:43 PM

View Posthellcat, on 23 February 2014 - 12:09 PM, said:

Sounds like a loose motor wire/connector.
I'm with Hellcat.

#5 willytg25

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Posted 25 February 2014 - 02:19 PM

View Postgcw360, on 23 February 2014 - 03:43 PM, said:

I'm with Hellcat.
So should I replace the motor/wires? What should I do to go about fixing this?

#6 iWar

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Posted 25 February 2014 - 04:22 PM

Have you removed the motor??? If not remove the motor plate and make sure the 2 motor connections are connected... If thats not it and assuming the fuse has not blown you either have a broken wire somewhere, burned out trigger contact (which highly I doubt), or the prongs on the trigger assembly are bent out and not making a connection when you pull the trigger... That happen to me when I first got my SR10...

#7 Larry

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Posted 25 February 2014 - 04:50 PM

Think I explained it in post eariler. Did you check battery, or fuse yet?

#8 willytg25

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Posted 01 March 2014 - 02:13 PM

View PostLarry, on 25 February 2014 - 04:50 PM, said:

Think I explained it in post eariler. Did you check battery, or fuse yet?
I have, batteries are good to go. Fuse looks great too. I'm going to swap out the motor sometime next week and see if that's the problem. Otherwise I'll get a new wire harness.

#9 Rain Man

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Posted 04 March 2014 - 07:35 AM

View Postgcw360, on 23 February 2014 - 03:43 PM, said:

I'm with Hellcat.
I am also with both of you. I guess swapping out the motor is a good idea.

Edited by Rain Man, 04 March 2014 - 07:36 AM.


#10 hellcat

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Posted 04 March 2014 - 03:42 PM

View Postwillytg25, on 25 February 2014 - 02:19 PM, said:

So should I replace the motor/wires? What should I do to go about fixing this?

No, you just need to make sure the spade terminals fit onto the motor terminals tight. If loose fitting just squeeze the spade terminal with a pair of pliers.
The terminal have been know to be a loose fit and slip off.

#11 gcw360

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Posted 08 March 2014 - 06:51 AM

View Posthellcat, on 04 March 2014 - 03:42 PM, said:

No, you just need to make sure the spade terminals fit onto the motor terminals tight. If loose fitting just squeeze the spade terminal with a pair of pliers.
The terminal have been know to be a loose fit and slip off.
Agreed, this is a common issues with AEGs that is one of the simplest to fix.




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