- Feb 2, 2018
- Kelowna, BC
i've got a 1990 hilux surf with a 2L-T in it, and i'm trying to diagnose why the glow plugs aren't heating very effectively. when i turn the key i hear the relay click, i get 10 volts to glow plug rail for about 8 seconds, then i hear the relay click off and there's no power at all. is this normal operation for my engine's relay? i've read that some relays from this era are meant to provide a burst of full power and then drop down to half power (5 volts in my case i guess) for some extended period of time to help with cold starts. does anyone know if my plugs are supposed to be doing that? or are they just supposed to come on at 10 volts for a while then turn off, like mine are currently doing?