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Timo

Member Since: 14 Jul 2011
Location: Peterborough Ontario
Posts: 171

1984 Defender 110 300 Tdi SW Alveston Red

glow plug relay

Hi all,

i am wiring up my glow plug relay and it does not seem to be working. My biggest confusion is about #4 from the photo below (white to any white vehicle harness.) My wire out of the wiring harness in the #4 position is black (not white)

The glow plugs "clicks" on and there is power to all of the glow plugs, but it never clicks off, I have waited about 1min and there is still power to the glow plugs

Even when it starts up and runs there is still power to the glow plugs. Something seems not right. Will continual power to the glow plugs over heat them or wear things out.

Any ideas?

Thanks

Tim Series II in pieces
1984 Defender 110 (3.5l V8 now 300TDI)

20th Sep 2014 10:22pm

Fifth Horseman

Member Since: 08 Mar 2011
Location: Lanarkshire
Posts: 322

2011 Defender 110 Puma 2.4 XS CSW Santorini Black

Not good having continual power to the glow plugs, it will drastically reduce their life.

A black wire from the 4 position doesn't sound right, although its possible the harness has been repaired / modified with the wrong colour wire. Black is normally earth and if this is the case then that is the cause of your problem.

Pin 4 should be live with the ignition on
Pin 3 should only be live with the ignition switch in the state start position.

Are you sure the wires to pins 4 & 6 have not been swapped?

If all the wiring has the correct voltages then unfortunately its the timer unit at fault.

Edited to correct typo.

Last edited by Fifth Horseman on 21st Sep 2014 7:53pm. Edited 1 time in total

21st Sep 2014 8:01am

Timo

Member Since: 14 Jul 2011
Location: Peterborough Ontario
Posts: 171

Hmm. I am not sure i have #3 wired up properly. I have it to a continual switched power source. Not connected to the starter switch

I am not sure the harness has not been bodged by the PO at some point in time. I am going by the relay wiring and wiring chart and not what colour the wires are

I will keep playing with this trying not to blow up the relay....

Tim Series II in pieces
1984 Defender 110 (3.5l V8 now 300TDI)

21st Sep 2014 12:40pm

Timo

Member Since: 14 Jul 2011
Location: Peterborough Ontario
Posts: 171

Success. When I ignored what colour the wires were and figued out when you flip the relay from the bove photo things are then backwards.....it worked just fine

I cant seem to get the lamp on the dash to turn on. Any suggestions here. If not I will just listen for the click

Cheers

Tim Series II in pieces
1984 Defender 110 (3.5l V8 now 300TDI)

13th Oct 2014 9:49pm

Fifth Horseman

Member Since: 08 Mar 2011
Location: Lanarkshire
Posts: 322

Is the bulb ok (sorry if you've already checked it)

Does the other side of the bulb have a supply to it? It should be a switched 12v, same as that to pin 4 of the relay.

14th Oct 2014 5:07am

Timo

Member Since: 14 Jul 2011
Location: Peterborough Ontario
Posts: 171

I checked the bulb with a power source and yes it works. So is the wire from the relay basically the ground? If so I need to wire up the light to a new power source on one side then hook the wire from the relay to the other? I did not try this. (If I had looked properly at the wiring diagram I would have known this....) Thanks

T_ Series II in pieces
1984 Defender 110 (3.5l V8 now 300TDI)

14th Oct 2014 1:33pm

Fifth Horseman

Member Since: 08 Mar 2011
Location: Lanarkshire
Posts: 322

Yes thats correct, the relay supplies a ground to the lamp.

14th Oct 2014 6:14pm

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