4440 light switch/system question

Ragnarok

Member
I have a customer who swears that his rear flood lights are coming on when he has the switch in the warning light headlamps position.

I checked it out and yes...with the light switch in the next to field lights position(head lights and warning lights on)...if you click the dimmer switch to bright you get all headlights(bright) and the top rear field lights....


Seems normal to me....am I mistaken that the top rear floodlights should be on with the headlights and warning lights in the bright position??


I checked another 4440 that's on the place and it has no rear flood lights period....they are there but don't work


Thanx, Rag
 
Are his red fender lights working on the rear? These should be on with the warning flashers and the front headlights, Do the rear flood lights work in the field position? Just thought of this, did somebody switch the wires between the red fender lights and the field lights right above the red lights?
 
Wasn't there some issue with the light switch in that era Deere? I had to replace
mine because it was acting weird as well. Maybe an internal short?
Ben
 
I would replace the switch first as they can do funny things when they go bad. IF it looks newer than start checking wiring. Someone has butchered the cab harness. Usually they do it at the bottom of the cab.
 
1.There has been comments on this forum before regarding one of the terminals on the light switch being overloaded and prone to failure. I have also experienced this on either a 50 or 55 series, I cannot remember witch.

2.I have an operators manual for the 50 series and the lighting and signals are all nicely explained. I assume this is true for the 40 series. I suggest you ask your customer for the Operators Manual. If you cannot find one let me know I will describe what I have in the 50 series manual. As was already commented, I would start with the switch.

I cannot find a copyright on the Operators Manual but there is one on the Technical Manual.

Paul
 
Here is the link to the post regarding the light switch I was talking about. To search you have to go to the Modern View.

https://forums.yesterdaystractors.com/viewtopic.php?t=1372638&highlight=

Paul
 

She lights up likes a million bucks...red tail lights and all...right turn... left turn....running lights....field lights....brights….dims....warning-lights etc. Has red lights on the fenders for sure.


She does light-up the top rear flood-lights on bright in warning head light position......fender rear floods come on in field light switch position(bright with dimmer).....all lights work in some switch(switche's) position or another
 
Now you just need to through some LED's on there. Then it will light up like 30 Million Bucks. :) There are other places but I have used Tiger Lights. Paul

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cvphoto11207.jpg


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BLUF, the middle lighting relay needs to be replaced with a double normally open relay. (Bosch 0-332-015-001, around $25 on eBay)

I suspect the lighting relays have been replaced at sometime. I went through this on my 4440 a while back and it took a good amount of digging to discover the issue as this goes back to a mess up John Deere created when replacing an obsolete part.

Originally, those series tractors came with 3 relays to support the following operations.
mvphoto30988.png


1. The left relay powers the front flood lamps when the light switch is in H and the dimmer switch is in HI. (JD AR74411)
2. The middle relay powers the front flood lamps and also the right relay when the light switch is set to F. (JD AR84133)
3. The right relay powers the upper rear flood lamps when the light switch is in F and the dimmer switch is in HI. (JD AR74411)
[i:d6991045fa](*The head lamps and lower rear flood lamps are powered directly through the light switch.*)
[/i:d6991045fa]

At some point, John Deere superseded the AR84133 relay with the AR74411 relay. The problem with this is that the AR74411 is a NO (normally open) relay with a common link across the 87 terminals, while AR84133 is a double NO (normally open) relay with an 87 terminal and an 87b terminal.

AR74411 schematic
mvphoto30998.png


AR84133 schematic
mvphoto30999.png


Since the terminals are linked on the AR74411 relay, applying power to one terminal also powers the second terminal. This results in the right relay being powered every time the left relay is powered (light switch is in H and the dimmer switch is in HI), instead of needing the light switch to be in the F position.

Hope that helps.
Scott
 

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