300Tdi Defender won’t start when glow plugs are on

bojackhorse · Dec 17, 2023

I have a strange issue where the starter motor won’t do anything whilst the glow plug relay is on. If I wait until after then it works or if I disconnect the glow plug fuse then it works straight away. I’ve checked the engine to chassis to battery straps and they seem fine. Any ideas?

julianf · Dec 17, 2023

My guess would be a faulty relay.

Hypothesis - volt drop from the plugs stops the relay (I'm talking the cube things, not the solenoid) from being able to energise properly.

I mean it's just a guess, but thats what I'd go with first.

boguing · Dec 18, 2023

julianf said:
My guess would be a faulty relay.

Hypothesis - volt drop from the plugs stops the relay (I'm talking the cube things, not the solenoid) from being able to energise properly.

I mean it's just a guess, but thats what I'd go with first.

I've had a long look at the wiring diagrams and that's the only guess that I could come up with too. (Assuming that all connections are indeed 'good').

300Tdi Defender won’t start when glow plugs are on

bojackhorse

New Member

julianf

Well-Known Member

boguing

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