L2350DT 4x4 Glow Plug Question

[Flintknapper]

That is interesting but confusing to me. On my L185 the key-switch has four positions Off, Run, headlights low, headlights high. There is a separate switch that that operates the glow plugs when turned left and the starter/glow plugs when turned to the right.

The oil pressure light and charge light are on when the key is turned to the on position so the lights have no indication on the glow plugs, but do indicate that power is ready to be applied to the glow plugs. Once power is applied to the glow plugs then the glow plug indicator will glow (in dim light)

Please explain how your key switch operates and how it applies power to the glow plugs.

On my tractor the key switch operates as such.

1. Off position is straight up (no dash lights, no activation of anything).

2. First position to the right (clockwise): The dash lights (Oil and Charge) light up and power is available to every circuit connected to that key position.

3. Second position to the right: Is the 'start' position and naturally it acts as a spring loaded momentary switch, returning to the run position once released.

4. ***The one we are interested in***. This position (key moved and held to the left) is also spring loaded and operates as a momentary switch. This is the only other position at which the Oil and Charge lights illuminate. They only light up as long as you are holding pressure against the key switch, activating the Glow Plugs.

It is not my assertion that they are meant to be dedicated 'Glow Plug Lights' (labeled as such, as they are not). Only that they DO come on when activating the glow plugs.

It seems pointless for them to operate in that position only to show that they 'work' when that feature already exists in the 'run position of the switch. But perhaps its simply a function of the wiring.

The glow plug 'indicator' is what I watch, since that is what it is intended for.

Don't know if that any of that information helps or answers your question.

 

[Russell King]

@Flintknapper

Thank you, that eliminates all of my confusion (in my head) about the lights and glow plug indicator operation.

Thank you, I would guess that the logic of having the light bulbs turn on in the glow position is to prove that there is power to the switch (without having any extra wiring or bulbs involved).

 

[Flintknapper]

@Flintknapper

Thank you, that eliminates all of my confusion (in my head) about the lights and glow plug indicator operation.

Thank you, I would guess that the logic of having the light bulbs turn on in the glow position is to prove that there is power to the switch (without having any extra wiring or bulbs involved).

That was my conclusion as well and the reason I mentioned it, so it might be used as a diagnostic tool for the OP to determine IF power was making it at least that far in the circuit.

 

[Russell King]

L2350DT Glow Plug Issue, I get a light on the console when key turned to LEFT, but there is no voltage at the glow plug. Disconnected Hot wire from Glow Plug and zero volts. Is there a relay some where??

@Flintknapper In the first post (copied above) was the mention of a light. That was where my confusion started but that is cleared up now.

It is still an interesting problem since @mcnuttja01 say the lights are on and the indicator glows but there is no voltage at the glow plugs.

I am still guessing that some one messed with the wiring or there is a short between the indicator and the glow plugs. Either should be a simple fix if the wire is easily accessible.

 

[Flintknapper]

@Flintknapper In the first post (copied above) was the mention of a light. That was where my confusion started but that is cleared up now.

It is still an interesting problem since @mcnuttja01 say the lights are on and the indicator glows but there is no voltage at the glow plugs.

I am still guessing that some one messed with the wiring or there is a short between the indicator and the glow plugs. Either should be a simple fix if the wire is easily accessible.

Break in the wiring from indicator to glow plugs or dead short along the way would be my guess. If it were me I would work my way from the glow plugs backwards. A simple test light would be the easiest thing to use (probe the wiring). Find out where there ceases to be voltage.

Just need someone to turn the key for you for a few seconds. Rats and mice love to chew on the wire insulation and will even chew through the copper wire itself. So worth looking for that visual clue.

 

[GreensvilleJay]

After 2 pages...might be time to 'reset'

1) disconnect starter control wire.
2) put DVM on 'glow plugs' and ground.
3) turn key to 'start'. Do you have 12 volts ?
4) turn key to 'preheat'.Do you have 12 volts ?

According to the wiring NIW supplied the answer to both should be 'yes'.

 

[jaxs]

After 2 pages...might be time to 'reset'

1) disconnect starter control wire.
2) put DVM on 'glow plugs' and ground.
3) turn key to 'start'. Do you have 12 volts ?
4) turn key to 'preheat'.Do you have 12 volts ?

According to the wiring NIW supplied the answer to both should be 'yes'.

Reset indeed, what was said wasn't what was heard or what was heard wasn't what was meant. Such as "there isn't 12 volts at GPs when key is in perheat". Of course there isn't because of voltage drop across indicator. Details,details,details. I fear we have one of those in a room full of deals since op went awol over 24 hours ago.

 

[Flintknapper]

I fear we have one of those in a room full of deals since op went awol over 24 hours ago.

Even if the OP's tractor issue isn't solved, the discussion is worthwhile (IMO) simply for Posterity's Sake.

There are a good many L2350's out there (aging more each day) and this same issue might arise for someone else in the future.

Heck, might even happen to mine.

 

[jaxs]

Even if the OP's tractor issue isn't solved, the discussion is worthwhile (IMO) simply for Posterity's Sake.

There are a good many L2350's out there (aging more each day) and this same issue might arise for someone else in the future.

Heck, might even happen to mine.

Your sprite is well placed but unfortunately op picked up his marbles before we could get key details necessary to figure out what's wrong.
In the vain of what you are suggesting, a discussion on diagnostic techniques would benefit far owners than spoon feeding info to one owner about one tractor. It's the principle of "give a man a fish and you feed him for a day, teach a man to fish and he will feed himself for a life time."

 

[mcnuttja01]

@Flintknapper In the first post (copied above) was the mention of a light. That was where my confusion started but that is cleared up now.

It is still an interesting problem since @mcnuttja01 say the lights are on and the indicator glows but there is no voltage at the glow plugs.

I am still guessing that some one messed with the wiring or there is a short between the indicator and the glow plugs. Either should be a simple fix if the wire is easily accessible.

Yes, I found a short in the wire from the SWITCH to the Glow Plug.

 

[mcnuttja01]

I found the problem, short in the wire from SWITCH to GLOW PLUG.

Thanks for the assistance,

Jerry