Glowplugs
 

Previous owners given me a nice but bad mod.
An unfused manual glow plug switch...
So I found out my glowplug are good still after an hour and a half of flattening my battery after I must have knocked the switch.
That's now been changed to a push button to glow.
Question. Plugs, do they take 12v or are they 11v, and what sort of fuse shall I add to this home brew relay?

Are you asking if the GPs are made for a 12VDC system? Yes they are made for a 12V system but you will probably measure closer to 11V at the GPs while energizing them because of the resistance losses in the wiring circuit.

Yes, I was, thanks. I thought that maybe the factory relay had a regulator that dropped the voltage slightly.
Am I right these require an 80A fuse?

80A is what the original strip fuse on the bottom of the stock GP relay is rated for. Seems like that certainly should do the job.

IIRC the theoretical math is the "fast" glow plugs like these draw around 12A apiece once running at steady state. So if that is the case then with 6 live plugs 72A is the current the system needs to carry. 80A would give enough headroom to accommodate that with a good margin.

The fun use of those figures is when there are symptoms of a dead plug or two you can measure the total current to the glow bus with an inductive ammeter and with that number determine how many plugs are running and how many are dead. Of course then after the science experiment the task of finding the dead plug(s) still remains. :cool: