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94 glow controller

ak diesel driver

ak diesel driver

6.5 driver
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alaska
Can anyone tell me which of the 3 wire going into the glow contoller I should tap into for my OPS mod I want to do? I want the lift pump to run in th WTS mode. Or would it be better to just tie into the wire going directly to my glows? Either way I'll be using a diode.
 
What you could do is tap into the output of the 5amp Glo fuse. This is a source from the glo controller output that goes to the lamp in the instrument panel and feedback to the PCM.

EDIT: you want both OPS power and Glo Power to go to the relay coil, brain fart before.

Or you can tap into the glo output line anywhere. Unfortunately, our controllers did not include the relay pin, it was replaced by PCM trigger input.

That PCM trigger input is also 12V to trigger the Glo, which goes to pin B of the controller. But I would use the controller output, instead of drawing more current from the PCM.
 
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Just remember in the hot days, the glow only glows for a short time (sec) means that the LP will just prime for less than that. Which may not be a problem in AK. though.

My dad did something with tying the LP relay to the GP cycle but then it does not work too well in the summer. Turns out his OPS was bad anyway. That is a 95.
 
My Kennedy LP/OPS harness have a pre-primed during key on before crank. I did not have the knowledge yet at that time when I bought the truck so I bought the harness from a fellow member.

There are a writeup somewhere about how to hook up the NC terminal on the relay to an Ign On to get it pre-primed. Some people have done it too. If it is not here, try to search at DP.
 
Well, you can put the ignition to the normally closed terminal, which is 87a on the relay, but that defeats the purpose of the OPS, because as soon as your OPS shuts off the LP is still going to run as long as the key is in the on position.

Also that means you are drawing more current through the ignition switch. It is better to have the glo output run to the coil of the relay (low current) and just allow LP current to flow straight from the battery source.

So this means putting both OPS power and Glo power to the relay coil, contact 85 or 86. And using a diode on the lines as AK said.
 
I wired a 2 way toggle switch in,one side bypasses the OPS,the other for extra glow via a 30 amp relay,I tapped in from the fuse box auxillery stud to power the relay and the LP via the toggle.
only the glow side of the switch is spring loaded.
 
If the engine is warm or intake air is warm it will have a short cycle. and it wont cycle multiple times in a row, because it knows the last time you cycled and calculates a heat loss of the plugs.
 
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