1KZTE KZJ78 glow plug questions

[Waikato Willy]

so glow plugs died, no power to glow plug side of the glowplug relay, however i can hear the relay click off after about twenty seconds

I thought easy solution , bypass circuit and wire straight to battery through the glow plug relay, sweet works mint, but NO , when key is on circuit acts properly- times off after about 20 seconds, when vehicle is running glow plug circuit stays on and does not turn off

the relay is not switching off and also is not getting the power it is meant to get for the glow plugs

Any idea how this circuit is getting its power? is it from the ECU? and switched from the ECU?

I have since just bypassed the whole circuit and just have a push button that operates the stock glowplug relay to work as it should

not to bothered about this , kinda of a good antitheft device in winter time but am puzzled why this would die

Is there a big fuse hiding somewhere for this circuit?

Thanks for anybody's help

 

[kbushnz]

The glow relay is controlled by the ECU.
The relay gets its power from the fuse panel. Check the glow fuse.
Also check all the fusible links at the battery terminal.

 

[Waikato Willy]

is it just the fusible links on the battery or is there some hiding anywhere else?
Ive got rid of them and Im using a fuse holder bolted to the battery off a R34 skyline that has normal 80a 60a and 30a holders
glow fuse is good and there is a circuit there as well,. might just leave it I think at least I know it is working

I read 12v might be bad for the glow plugs? Not sure about this I modded my old 1964 international tractor 444 with denso 12v toyota glowplugs and they have been in there for 5 years still going strong

 

[Lomoski]

The glow fuse is in the fuse box by your drivers foot to the best of my knowledge.

 

[coldtaco]

Most of these glow plugs are a low voltage type. Hit with say 11V for a couple seconds then get half power for as long as the computer thinks it needs it. So if you are doing a manual style you need to either get a higher voltage glow plug, and get a spare one to test to see how long full voltage will take to kill the glow plug