I've got a 1996 300tdi Discovery, the glow plugs won't work (No power) when the yellow/ black cable from the timer is connected. If i disconnect the lead from number 4 glow plug and test it with a meter there is power when the ignition is switched on until the timer switches itself off. I'm thinking it could be an earthing problem from the engine to the chassis, how many earth points are on the engine? And has anyone had the same problem. Cheers Mark
Glow Plug Problem
- Thread starter marzco
- Start date
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cossiedreamer
New Member
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- 202
There's 1 earth engine to chassis, located kinda underneath the turbo/exhaust manifold area, remove air intake pipes and you can see it clearly a braided hose/wire, nuts arnt easy to get to so just bolt on another anywhere i think it should have two anyway retrofit a nice bit of wire around it and tighten onto the suspension mounting above it.
TheMunster
Active Member
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Agree with Sean, even if there is a load of current flowing if one or all of the plugs are 0R (no resistance/dead short) then you won't read any voltage accross them when they are on.
how did you test them ?
the only way is to put a high curreent 12 volt supply across them and if they get hot they work
if you measure the resistance it will look like they are all shorted (unless you have a very good tester that can measure low resistance accurately)
As said you dont need them and it's gota be a wiring fault, you can have 12 volts with fookal amps so they are never gona heat up.
take a jump lead straight to them and see if they go, if they do then it's in the supply.
Well got to the problem of the glow plugs, found the brown lead from the battery which goes to a fusable link then to the glow plug timer as a brown and orange had been bypassed for some reason? The cable was joined together using an 8amp rated cable which in turn due to the load on the timer 70amp rated caused the 8amp cable to melt!! Which was'nt detected until i unbolted the fuse box in the engine compartment and found the offending cable tucked underneath PHEWW Upshot I've managed to put right the wrong and works perfectly. Thanks for all you suggestions and help.
Cooperman1
Member
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- Huntingdon
I had a starting problem with my 300 TDi during the recent really cold weather. I fitted new glow plugs and it made no difference, so I took a multi-meter to the timer relay. There is 12 v input from the big brown cab,e, but no output.
Fitting a new relay has made no difference.
Now being fed up with it i am ordering a 100 A relay, a push button starter switch and a small warning light. These will arrive next week than I shall re-wire it with manual control of the glow plugs, thus removing and simplifying the glow-plug system. The push button switch will be close to the key position and the relay will be in the same place as the existing relay.
Fitting a new relay has made no difference.
Now being fed up with it i am ordering a 100 A relay, a push button starter switch and a small warning light. These will arrive next week than I shall re-wire it with manual control of the glow plugs, thus removing and simplifying the glow-plug system. The push button switch will be close to the key position and the relay will be in the same place as the existing relay.
Magicgrotto
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KIN HELL 9 yrs to reply LOL
Shimsteriom
Master Procrastinator
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Better late than never!
Magicgrotto
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Think it will av more problems that just the glo plugs after 9yrs
