K74 indicator and hazards problem

#1 by Lewisk74 , Sun Dec 01, 2019 9:08 pm

Hi all,

Would really appreciate if someone can point me in the right direction.
I have a 2005 k74 L200 2.5td Trojan.
The indicators along with the hazarss have started acting up and have an intermittent fault.
On initially starting to drive they won't work at all both indicators and hazards.
If i press the hazard light switch a few times repeatedly until i see them come on and i then try and operate the indicators the left indicator will start to work the odd time first and then if i try the right indicator it might work it might not or sometimes they both work fine. Very erratic.
Reading other related threads i discovered the l200 has both an indicator relay under the dash that has the light attached for towing and an indicator ecu under the cover in the nearside footwell.
I have swapped the relay under the dash for another indicator relay without any change in symptons.
As for the indicator ecu mine is fitted with part no MN107599V
Im abit confused with this as when searching for the part it comes up with both indicator ecu and shift ecu?
Also there is part numbers mn107599 and MR222643 also advertised as indicator ecus mr222643 being up to 04 MY apparently?
A mate has a 2002 l200 and i tried the MR222643 indicator ecu with no change in symptoms either.
Im going to order another indicator ecu, is there aby difference between mn107599v and mn107599?
Has anyone got any ideas or had a similar problem?

Posts: 3
Date registered 11.26.2019

RE: K74 indicator and hazards problem

#2 by krutly , Sun Dec 01, 2019 9:21 pm

in the past there have been a couple of members on here that have had indicator issues and it's turned out to be broken wires in the indicator stalk
tell tale sign for this is the stalk getting warm when you try using the indicators, so might be worth checking that out

2003 4life now sold
2011 walkinshaw , lego mechanic

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Posts: 17.334
Date registered 10.21.2011

RE: K74 indicator and hazards problem

#3 by Heathen , Mon Dec 02, 2019 1:40 am

A dodgy stalk wouldn't affect the hazard lights, as it's completely bypassed when the hazards are on.
The part number MR222643 is for the 4wd ecu, and MN107599, apparently is "CONTROL UNIT,4WD INDICATOR " - neither of these will help the problem

MR563835 is the flasher relay part number, but if the indicators work properly (when they actually are working), it is unlikely to be the relay at fault.

Give these things a try:
1. First make sure all the fuses are ok and seated properly.
2. Make sure the hazard warning switch is plugged in properly, as power to the indicators still goes through it when the switch is off.
3. As you have an extra truck, try borrowing your mate's hazard warning switch.
4. If this still doesn't work, then your probably looking at a wire breaking down or loose connection somewhere.
5. Attach a wire from the positive battery terminal to the green wire going to the back of the hazard switch and see if that makes the indicators work properly.

'02 K74 single cab.

Posts: 1.059
Date registered 05.20.2016

Last edited 12.02.2019 | Top

RE: K74 indicator and hazards problem

#4 by 123hotchef , Mon Dec 02, 2019 7:29 am

check your tow bar socket wiring


Forum Legend
Posts: 34.080
Date registered 02.15.2012

RE: K74 indicator and hazards problem

#5 by Lewisk74 , Mon Dec 02, 2019 4:47 pm

Thanks very much for all the replies.
I'll check and try everything thats been mentioned.

Posts: 3
Date registered 11.26.2019


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