Jump to content

Low Oil Pressure sender Lpws4 Lister


Plonk

Featured Posts

Hi folks. 

My Lister Lpws4 has a leaky low oil pressure sender. I think it must have been weeping for a while but I now think it is getting worse. The audible alarm stops when I start the engine, but I'm not sure if this alarm is also connected to the charge circuit. I don't appear to have a lighting up pressure  warning light on the warning light panel.

Before I change the sensor, I would like to find out what the 3 terminals are for. I am familiar with the  single wire type connected on car's.  3 terminals seems two too many! Are they, + (feed), buzzer and light? As the unit is leaky, I guess it may be the cause of the  warning lamp failure.

On a car it would be a simple case of touching the  sender +feed to earth, I fear if one of these wires is live, touching it to earth might blow something, as might connecting a live feed to one of the other terminals? 

I have no idea where I could get hold of a wiring diagram.

Thanks in anticipation,

Patrick.

Link to comment
Share on other sites

4 minutes ago, Plonk said:

Hi folks. 

My Lister Lpws4 has a leaky low oil pressure sender. I think it must have been weeping for a while but I now think it is getting worse. The audible alarm stops when I start the engine, but I'm not sure if this alarm is also connected to the charge circuit. I don't appear to have a lighting up pressure  warning light on the warning light panel.

Before I change the sensor, I would like to find out what the 3 terminals are for. I am familiar with the  single wire type connected on car's.  3 terminals seems two too many! Are they, + (feed), buzzer and light? As the unit is leaky, I guess it may be the cause of the  warning lamp failure.

On a car it would be a simple case of touching the  sender +feed to earth, I fear if one of these wires is live, touching it to earth might blow something, as might connecting a live feed to one of the other terminals? 

I have no idea where I could get hold of a wiring diagram.

Thanks in anticipation,

Patrick.

Electric pressure gauge and oil light?

Link to comment
Share on other sites

23 minutes ago, Plonk said:

I have no idea where I could get hold of a wiring diagram.

Send me a PM with your email address and I'll send you the workshop manual (110 pages - should show what you want)

 

I cannot attach it here as it is a Pdf (which are not allowed to be attached)

Edited by Alan de Enfield
Link to comment
Share on other sites

No guage, just buzzer and light. There is a big white control box in the engine comparment though!

The sender looks like a normal small low pressure warning sender

 I guess just simple contact switch inside.

Link to comment
Share on other sites

Unfortunately the manual online only goes to page 109. Wiring is on page 129. 

On thinking about it,. I would guess that the wiring might  be 12v feed, buzzer out 12v no pressure,  light out 12 v pressure. ? I will hopefully figure it out when the new switch comes.

Edited by Plonk
Link to comment
Share on other sites

It’s a changeover type switch (spdt) touch the non black wire to earth to check wiring / bulb 

 

sounds like bulb has gone if buzzer working. It has no impact on charging unless none of the lights are working which is a different issue I would think 

 

Big white box isn’t relevant although check the two circuit breakers on the top of the box one is for the stop solenoid and I think t’other supplies the instruments. 

Link to comment
Share on other sites

23 hours ago, Plonk said:

Unfortunately the manual online only goes to page 109. Wiring is on page 129. 

On thinking about it,. I would guess that the wiring might  be 12v feed, buzzer out 12v no pressure,  light out 12 v pressure. ? I will hopefully figure it out when the new switch comes.

oops -sorry I'll email that section.

The 'most important one & I didn't send it.

 

 

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • Recently Browsing   0 members

    • No registered users viewing this page.
×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.