Yet another glow plug thread -- 81' HJ47 (1 Viewer)

Joined
May 25, 2019
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Denver, CO
Been lurking the forums for a long time now and figured it was time to join officially.

I have a 1981 HJ47 RHD, originally from Australia, and have the dreaded "click" but nothing more when trying to glow or start. I pulled the glow plug relay and tested with a multimeter (relay part number is the 28610-46030) -- I'm getting +12V on the B terminal of the relay, and nothing on the G terminal when turning the key to glow or start. I can occasionally get a reading of ~+10.5V on the G terminal when the relay is intermittently functioning, but it's left me high and dry in a parking lot before and I need it to be reliable while I'm working on our other vehicles.

That said, I've searched thick and thin, and learned a ton of useful info regarding the glow plug wiring (and some of the erroneous material in the FSM), but haven't seen much in the way of retrofitting an aftermarket glow plug / starter relay into the setup / wiring on my rig. I picked up a glow plug relay that looks to be a reasonable replacement, pic below. I wanted to consult ya'll regarding the wiring before proceeding.

1986338


My plan was to run the original wire from the battery feed "B" terminal of the stock relay to the left-hand post in the pic above, and the glow feed "G" terminal of the stock relay to the right-hand post, but I'm not sure how to wire the front two terminals. The front terminals on the aftermarket relay are marked "S" and "I", I took that to mean "start" and "ignition", but I'm not sure where to wire in the glow / start wires of the ignition switch. My rig has an EDIC motor, and I've been using the diagram below as a reference for my wiring (shout out to lostmarbles for his excellent work here, credit goes to him for the diagram). Any help would be appreciated.

1986339


Thanks!
 
Joined
Mar 3, 2012
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982
Location
Adelaide, South Australia
I would honestly just leave all of the factory wiring alone and not try to integrate any of it..Instead of using the turnback function of the ignition switch I would wire in a push button to your new glow relay and a new cable from 12V+ on the battery to your solenoid and a big thick wire to your glow rail (after removing everything but the main glow rail on the glowplugs).

When its super cold this gives you the ability to hit the glow button for a few seconds after the vehicle has started and will prevent any future faults from degraded factory wiring.

Being an HJ47 without SuperGlow it already has the correct voltage plugs for a Wilson Switch.
 
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Joined
May 25, 2019
Messages
3
Location
Denver, CO
Thanks Duncan.

I was aiming to retain the factory setup, but I'm starting to feel like wiring in a Wilson switch would be the best (I suppose this is why everyone else has gone this route :) ).

That said, right now, my bad glow plug relay is keeping the starter from turning over. How do you prevent the bad glow plug relay from keeping the starter relay from closing? I wired in the new relay from my previous post today to test, -- it's a 4 wire relay and has the starter running when the key is in both the "glow" and "start" positions.

This is baffling, as running the new relay with either of the "glow" or "start" wires connected will turn over the starter when the ignition switch is in the "start" position. When both the "glow" and "start" wires from the ignition switch are connected, the ignition switch will turn the starter in either of the "glow" or "start" positions.

Any help would be appreciated.
 
Joined
May 25, 2019
Messages
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Location
Denver, CO
SO -- bumping to ask the question, why in god's name would this relay trigger the starter when turned to both the glow and start positions? Shouldn't the wiring to the glow plug relay only be controlling whether or not the glow plugs heat both when the ignition switch is turned to glow and start? And not have any control over the starter being triggered when the key is turned to glow?
 

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