Outer Limits 4x4 Board

it seems the solenoid for the glow plugs on my landcruiser has failed me. so the last few days i have been bridging the positive from the battery onto 1 of the glow plugs to get me to work in the morning, this has worked fine.
however this morning it didnt work.
have a fawked something up?
or is there a different way to get past the solenoid?
cheers

Also, where the hell is this solenoid on a HJ75 with the superglow system? Under dash d/s or engine bay rear d/s?

try the owners manual??

Well, we don't know what model Landcruiser it is, so we need that info. If it's the superglow that's used in 'Cruisers from '83 to '88, they use 6 volt plugs, by applying 12 volts direct to the glow plugs, you'll kill them. As for how the superglow works, there's the glow timer, which is inside the cab on the firewall somewhere, the main relay and sub relays in the engine bay. The timer activates the main relay in the engine bay, this will send 6 volts to the plugs for a few seconds. Then the timer tells the main relay to open, no 6 volts on plugs now. The timer then activates the sub relay in your engine bay (when you put the key to 'start'), this sends a voltage to the 2 resistors located on the side of the intake manifold. The voltage is dropped across these resistors so 2.4 volts (or thereabouts) is sent to the plugs for I think 10 seconds or so - this makes the cold engine run a bit smoother on startup.

Sorry for the long winded info, any questions just ask or if you need pics to help understand it. Too late for this sort of thinking.

hj 45 wrote:Well, we don't know what model Landcruiser it is, so we need that info. If it's the superglow that's used in 'Cruisers from '83 to '88, they use 6 volt plugs, by applying 12 volts direct to the glow plugs, you'll kill them. As for how the superglow works, there's the glow timer, which is inside the cab on the firewall somewhere, the main relay and sub relays in the engine bay. The timer activates the main relay in the engine bay, this will send 6 volts to the plugs for a few seconds. Then the timer tells the main relay to open, no 6 volts on plugs now. The timer then activates the sub relay in your engine bay (when you put the key to 'start'), this sends a voltage to the 2 resistors located on the side of the intake manifold. The voltage is dropped across these resistors so 2.4 volts (or thereabouts) is sent to the plugs for I think 10 seconds or so - this makes the cold engine run a bit smoother on startup.

Sorry for the long winded info, any questions just ask or if you need pics to help understand it. Too late for this sort of thinking.

yes that sheds bit more light on my situation.
the car is an 84 HJ47. i am not sure if it has the superglow system, i do know that it has brand new glow plugs about 2 months ago.
it was mr nrma that told me it would be a solenoid, but in what you wrote you did not mention a solenoid anywhere.
i am getting an auto sparky to check it out today.
i have a bad feeling i have fried the glow plugs as it used to spark at first when connecting the positive to the plugs, now there is no spark

mr nrma was the one to tell me to bridge from positive to the plugs. if i have fried them can i chase the nrma up for new ones for free???

An '84 HJ 47 uses the superglow system that I detailed earlier. The main and sub relays are located behind the driver's side headlight. also, check the aluminium busbar that connects between the glow resistor and a bolt on the intake manifold, it has two wires going to a plug. This is called a current sensor, this busbar can break or corrode through and you won't get power to the plugs. Your plugs are definitely fried too.

hj 45 wrote:Your plugs are definitely fried too.

thanks

hj 45 wrote:Well, we don't know what model Landcruiser it is, so we need that info. If it's the superglow that's used in 'Cruisers from '83 to '88, they use 6 volt plugs, by applying 12 volts direct to the glow plugs, you'll kill them. As for how the superglow works, there's the glow timer, which is inside the cab on the firewall somewhere, the main relay and sub relays in the engine bay. The timer activates the main relay in the engine bay, this will send 6 volts to the plugs for a few seconds. Then the timer tells the main relay to open, no 6 volts on plugs now. The timer then activates the sub relay in your engine bay (when you put the key to 'start'), this sends a voltage to the 2 resistors located on the side of the intake manifold. The voltage is dropped across these resistors so 2.4 volts (or thereabouts) is sent to the plugs for I think 10 seconds or so - this makes the cold engine run a bit smoother on startup.

Sorry for the long winded info, any questions just ask or if you need pics to help understand it. Too late for this sort of thinking.

ive just had a auto electrician and the mechanic at the shop where the glow plugs were replaced in april of this year tell me that i should be using 12v plugs instead of the 6v one that were put in. i must not have the super glow system even though mine is an 84 model. my system is almost the same as what you said, the last point before the glow plugs is 12 volt so i think i should have 12v plugs in there.

anyway its going back to the shop tomorow morning to get looked at.

The only way 10.5 or 12 volts plugs should be installed into a HJ 47 is because someone has bypassed the entire superglow system and replaced it with a home made wilson switch setup. Do you have a manual push button to activate the glows? The normal superglow is pretty much automatic, you glow by putting the key into the 'on' position, the glow light will illuminate for a few seconds, it goes out, you start the motor.

hj 45 wrote:The only way 10.5 or 12 volts plugs should be installed into a HJ 47 is because someone has bypassed the entire superglow system and replaced it with a home made wilson switch setup. Do you have a manual push button to activate the glows? The normal superglow is pretty much automatic, you glow by putting the key into the 'on' position, the glow light will illuminate for a few seconds, it goes out, you start the motor.

i think it should had "marked 11v" glow plugs in it.
if you look in the owners manual there is the super glow sytem for later models and there is a more simpler setup for earlier models

The 11 V plugs are for vehicles later than 1988. My '84 HJ 47 with superglow uses 6 volt plugs and they work great......now.

only advice i can offer is dont bridge the glow plugs to the battery.