12HT Intake Heater / Glow Screen help

[mudandrock]

Thanks for that reply, just I am looking at removing the glow plug/heater...

I live in Australia so generally temps are pretty good but occasionally we see 0 degrees.

Also if I take it to the snow might see temps as low as -4... is it even possible to start at that temp without a heater? (Eg lots of cranking?).

Cheers

Just unplug the EDIC located behind the glove box. It will never operate until you plug it back in. Generally the grid heater doesn’t even kick on until it gets down below 0 C. Which is why most people have a hard start when it starts getting cold... just not cold enough to kick on.

 

[mudandrock]

So I’ve had a 12HT in my 60 for a bit. Living in Texas I did not figure I’d need the glow screen. Spent 2 weeks in CO and WY last summer and the truck was a bit disturbed on the sub 35 degree starts. Was in the back of my mind to rig up the system but quite frankly had zero understanding of how it worked. Consulted a bit with a buddy @ceylonfj40nut and then stumbled across this thread and believe I figured out for myself how to do this. I’m actually getting a HJ60 going for a friend @LowDown that had a 12HT transplanted. Truck still has the hj60 harness so I went with one relay and tied it to the red side which I believe gives it an immediate kick. Wired in a momentary switch so it can be held as Long as needed and two...it won’t accidentally be left on. Used the 60 harness and clipped the ground and positive wires that lead into the relay (not the heavy gauge wires bolted to the posts). Then extended the ground to the fire wall and the positive to the dash where it plugs into the momentary switch. The other side of the switch is direct to the battery. This is a 24v system so I looped the switch to the negative terminal on the RHS battery (12v). Relay still fires and sends the voltage to the glow screen. I tested it this way since my personal truck is 12v. Wanted to see if the relay actually works and it does. Question for y’all...do I leave it on the negative post or move it to the positive/24v post? Thanks. Jim

@CenTXFJ60 I think you might be over thinking your design. I’ve seen these 24v screens run on just 12 v without a problem, I’m sure where you ground will have now baring on how it operates.

 

[mudandrock]

The factory harness on a HJ61 has two relays... one for pre-glow and one for afterglow. I find the best way to hook up your momentary switch is to have a toggle that is wired to the pre-glow in the up position, and wired to the afterglow in the down position. That way you can give it some heat while it’s running to cut down on the white smoke and level out your RPMs until she warms up

 

[Feistl]

Just unplug the EDIC located behind the glove box. It will never operate until you plug it back in. Generally the grid heater doesn’t even kick on until it gets down below 0 C. Which is why most people have a hard start when it starts getting cold... just not cold enough to kick on.

Sorry I should have been clearer... I am rebuilding a HJ61 from the ground up and want to get ride of the heating element and stock throttle blade and replace it with a 76mm throttle body from a mustang. That way the entire intake/exhaust system will be 3" meaning much better flow. So I was just wondering if it's possible at all to start in really cold weather without the heater (even if it means lots of cranking). Otherwise I'll just carry a hair drier lol

 

[mudandrock]

I guess you could install a coolant heater and plug it in if you have to

 

[NaluNui96]

Hi
Can someone please measure the current, with a clamp on ammeter, through the glow screen wire when both elements are heating? 24 volts. 12HT.
This would be a big help. Thank you!