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Glow plug relay

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Dpcunningham
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PostPosted: Sun Jan 22, 2017 17:23    Post subject: Glow plug relay Reply with quote

ANYONE KNOW HOW TO TEST THE RELAY WITH A MULTI METRE
IVE PUT IN NEW GLOW PLUGS BUT STILL HAVING STARTING PROBLEM
FIRST THING IN MORNING
CHEERS
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peteinchad
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PostPosted: Sun Jan 22, 2017 17:33    Post subject: Reply with quote

When the engine is cold, put the multimeter on the Volts range and connect the red lead to the busbar and the black lead to the negative battery terminal.

Get someone to turn on the ignition and you should have approximately 12V showing on the meter for a few seconds.

What truck is it?
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Dpcunningham
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PostPosted: Sun Jan 22, 2017 19:32    Post subject: Glow plug relay Reply with quote

It's a 2.8 4m40 Mk2 pajero Japanese import
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Dpcunningham
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PostPosted: Sun Jan 22, 2017 19:49    Post subject: Glow plug relay Reply with quote

Pete my engine doesn't have a buzz bar
It's got 4 wires connected to each other should I buy a buzz bar
instead of using the wiring
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peteinchad
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PostPosted: Sun Jan 22, 2017 19:53    Post subject: Reply with quote

Other tests you can do:

1) Listen for the click on the passenger side, about 10 seconds after switching on the ignition - that will tell you if the ECU is activating the relay.

2) remove the small wire off the spade connector on the relay and use a long bit of wire to feed 12V from the battery positive terminal to the spade connector. The relay should click and you should get 12V at the busbar. Don't leave the wire on the spade for more that 10 seconds or you will burn out the glow plugs.
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Dpcunningham
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PostPosted: Sun Jan 22, 2017 20:03    Post subject: Glow plug relay Reply with quote

The ecu clicks about a minute or so after turning ignition
on but never heard anything from the relay
I'm thinking it's got to be a cold start problem as this morning
it wasn't for starting
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peteinchad
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PostPosted: Sun Jan 22, 2017 20:18    Post subject: Reply with quote

Do test (2) and see if the relay clicks.
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Dpcunningham
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PostPosted: Sun Jan 22, 2017 20:43    Post subject: Glow plug relay Reply with quote

I've just ordered a buzz bar from mitzybitz
but will do test 2 tomorrow
Thanks Pete
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kenthepipe
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PostPosted: Sun Jan 22, 2017 20:44    Post subject: Re: Glow plug relay Reply with quote

Dpcunningham wrote:
Pete my engine doesn't have a buzz bar
It's got 4 wires connected to each other should I buy a buzz bar
instead of using the wiring


I would replace the wiring with a buzbar, invariably wiring is susceptible to breaking down over time, at least you can eliminate the wiring from any problems.
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Taraswolf
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PostPosted: Sun Jan 22, 2017 21:05    Post subject: Reply with quote

Takes years and years for copper cable to go down the pan yes the connectors/lugs can fall apart but round the plug area should be dry anyways.
I would be tempted to take the plugs out and check them if after you checked the relay and all is ok to the heater plugs.
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Dpcunningham
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PostPosted: Sun Jan 22, 2017 22:34    Post subject: Glow plug relay Reply with quote

Thanks everyone for the reply and information
I've order a new buzbar from mitzy and tomorrow I'm going to
test the old plugs and other components because to be honest
it's worse now than before I changed the glow plugs
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kenthepipe
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PostPosted: Sun Jan 22, 2017 22:38    Post subject: Reply with quote

Taraswolf wrote:
Takes years and years for copper cable to go down the pan yes the connectors/lugs can fall apart but round the plug area should be dry anyways.
I would be tempted to take the plugs out and check them if after you checked the relay and all is ok to the heater plugs.



I never implied it would cure it, I suggested removing them would eliminate a possible weak link. As you say it takes years and years to erode, these Mk2's aren't exactly spring chickens !
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Dpcunningham
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PostPosted: Sun Jan 22, 2017 22:55    Post subject: Glow plug relay Reply with quote

These glow plug wires are not original specifications someone has made them
up but as I bought it in the summer I've not had a problem until a couple of weeks
ago but will go through it all tomorrow
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Taraswolf
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PostPosted: Mon Jan 23, 2017 18:18    Post subject: Reply with quote

did you connect your meter/test light to the heater plugs cables/buzz bar and turn ign on as that would tell you straight away if you have a problem with the heater solernoid/relay.
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Dpcunningham
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PostPosted: Mon Jan 23, 2017 19:15    Post subject: Glow plug relay Reply with quote

Nope not had time today maybe tomorrow but
will update tomorrow if I sort the problem
it was really cold this morning and took some
starting
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