Charge light connected engine will not stop !!

Hello all this is my first post so please be gentle

I have a series 3 ex millitary landy used to be used as a fome pump unit to put out fires on airfields.

Anyhow i bought it as a non runner only to find the engine is nackered so i have shoehorned a disco 2.5 engine in it however i have a strange problem with all wires conected except the charge light the engine starts and runs oil presure etc and turns off, however if i connect the charge light from the altenator when i turn the ignition on the light comes on i start the engine the light goes out i turn the ignition off the charge light comes back on and the engine keeps running !!!!

Should i have a diode or something inline with the altenator light ? its doing my head in the only way to stop the engine is to unscrew the charge light bulb lol i kind of understand how the charge light works you feed power to the light from the ignition then when the altenator starts chargeing the altenator sends power up to the bulbe aswell then the bulbe goes out correct???????

what could it be i dont have much hair but i have got less now pleeeeeasssse help before i rip all my hair out


Cheers guys any info would be verry much apreciated

look at how the stop solenoid wire is connected

fanatic said:

look at how the stop solenoid wire is connected

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Sorry for sounding a bit 40watt but stop solenoid??? do you mean fule cut off if so that is connected to ignition along with the glowplug realy shunt ARRRRRRRRRRR also along with the wire from the altenator so if you turn the ignition off the altenator keeps the fule cut off from engaging but how do i get round it??

Jonw said:

Sorry for sounding a bit 40watt but stop solenoid??? do you mean fule cut off if so that is connected to ignition along with the glowplug realy shunt ARRRRRRRRRRR also along with the wire from the altenator so if you turn the ignition off the altenator keeps the fule cut off from engaging but how do i get round it??

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diode to stop back feeding, depends how you wired it-but it sounds like what's happening at a guess or faulty ignition switch.

:beer2::beer2::beer2::beer2::beer2::beer2: :beer2::beer2::beer2::beer2:I'm not thinking clearly

fanatic said:

diode to stop back feeding, depends how you wired it-but it sounds like what's happening at a guess or faulty ignition switch.

:beer2::beer2::beer2::beer2::beer2::beer2: :beer2::beer2::beer2::beer2:I'm not thinking clearly

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Lol cool anyideas wher i can get a diode for this and what size ??

Jonw said:

Lol cool anyideas wher i can get a diode for this and what size ??

Click to expand...

As ****ed double check

Maplin

6A Silicon Rectifiers Free Delivery : Diodes : Maplin
www.jaycar.com.au/images_uploaded/P600A.PDF


just double check through specs it should be more than ample for what you need-my beer googles are on.

Thank you so much Fanatic you have been most helpfull

If you can visit a local store, if there is an asian guy explain what you want-tend to be very work and customer focused.
There may be a smaller diode in stock with correct characteristics that will more easily fit in heat shrink.

After multiple beers I am not at my best now, but the lamp in dash will be 5w max from memory so you will have 350-450ma load roughly. (ohms law)

You need to allow for transient voltage if alternator goes tits, so a diode that handles 20v or more a good idea.

i think your going at the problem from the wrong direction.... for the enine to keep running there has to be an electric feed to the stop solenoid on the injection pump.... somehow from the alternator warning light circuit...quick fix is to put an on/off switch into the stop solenoid feed.... but id be inclined to rewire both cos it feels like theres two wires shorting together somewhere., which could develope into other problems. check the wiring loom between the ignition switch and enine bay for physical damage .before you do anythin else.

you answered your own question a diode in the circuit to the charge light as previously mentioned in 200tdi with same problem of be unable to stop engine a IN4006 diode should do the job