glowplug output stage short circuit to positive

[Yaza01]

glow output stage short circuit to positive
hi all my cars has a problem glowplug lights is always on i have check all 4 plugs which read 0 ohms the relay reads 17 ohms at all 4 points i have opened up the relay and it looks good
testing voltage at power wire i gt 0 volts
all help.appreciated

also the glow plug light goes out at 70mph and returns once i has slowed down

cheers

 

[Yaza01]

it was a fuse