Manifold pre-heater

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Hey guys i have had some trouble getting the tractor started without plugging it in so i wanted to check and make sure that my manifold heaters are working correctly.  
I pulled them today, one broke during the process so that will need to be replaced.  I ran some tests to see what numbers the solenoid was putting out but i need your help trying to figure out what they mean.

I'm assuming these things work like a spark plug; they need positive from the solenoid and ground themselves out in the manifold hole?

I detached one of the cables to check ohms against ground.  With the key off i had 2.0 ohms.  With the key in the on position i had 4.6.  When i press the manifold heater button, it jumps off the chart.  Does this mean that my system is working correctly?  When i pulled a heater plug to check and see if it was getting hot i forgot to ground it, so at the time i thought it wasn't working but now i'm thinking its like a spark plug and needed ground.  Can someone tell me if the ohms and operation look correct? 

I would go back out and check the heater plug with ground but i'm already cleaned up, the solenoid is off the tractor, and i need my wife to push the manifold button.

Like i said one of heater plug ends broke on removal so i will have to replace that one, is it worth replacing the solenoid with an aftermarket for $25?  Everything was about as dirty as could be so i have been cleaning up my contacts but the solenoid itself is pretty filthy and corroded.  Wont get to call for parts until monday, anyone have an idea how much money the heater plugs are?

Thank you i appreciate it.

Edited by AC6080MAINE - 25 Feb 2017 at 3:13pm

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AC6080MAINE Members Profile Send Private Message Find Members Posts Add to Buddy List Silver Level Joined: 22 Nov 2016 Location: Maine Points: 60	Post Options Post Reply Quote AC6080MAINE Report Post Thanks(0) Quote Reply Topic: Manifold pre-heater Posted: 25 Feb 2017 at 3:11pm
	Hey guys i have had some trouble getting the tractor started without plugging it in so i wanted to check and make sure that my manifold heaters are working correctly. I pulled them today, one broke during the process so that will need to be replaced. I ran some tests to see what numbers the solenoid was putting out but i need your help trying to figure out what they mean. I'm assuming these things work like a spark plug; they need positive from the solenoid and ground themselves out in the manifold hole? I detached one of the cables to check ohms against ground. With the key off i had 2.0 ohms. With the key in the on position i had 4.6. When i press the manifold heater button, it jumps off the chart. Does this mean that my system is working correctly? When i pulled a heater plug to check and see if it was getting hot i forgot to ground it, so at the time i thought it wasn't working but now i'm thinking its like a spark plug and needed ground. Can someone tell me if the ohms and operation look correct? I would go back out and check the heater plug with ground but i'm already cleaned up, the solenoid is off the tractor, and i need my wife to push the manifold button. Like i said one of heater plug ends broke on removal so i will have to replace that one, is it worth replacing the solenoid with an aftermarket for $25? Everything was about as dirty as could be so i have been cleaning up my contacts but the solenoid itself is pretty filthy and corroded. Wont get to call for parts until monday, anyone have an idea how much money the heater plugs are? Thank you i appreciate it. Edited by AC6080MAINE - 25 Feb 2017 at 3:13pm

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jaybmiller Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 12 Sep 2009 Location: Greensville,Ont Points: 24334	Post Options Post Reply Quote jaybmiller Report Post Thanks(0) Quote Reply Posted: 25 Feb 2017 at 3:20pm
	These heaters are just low value resistors. I have one on my forklift... yes, gotta be grounded to work. At 2 ohms, it'd draw about 6 amps. ( 12V/2=6). You can't measure OHMS when you supply it with 12 volts,explains why the meter went 'funny'. I'd press the button, wait 60 seconds,hop off and LIGHLTY test the manifold for heat near the glowplug. It should be warm to HOT. The ammeter will go 'discharge' maybe 10 amps or more(depends on # of working glowplugs). Jay
	3 D-14s,A-C forklift, B-112 Kubota BX23S lil' TOOT( The Other Orange Tractor) Never burn your bridges, unless you can walk on water

JC-WI Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 11 Sep 2009 Location: wisconsin Points: 34170	Post Options Post Reply Quote JC-WI Report Post Thanks(0) Quote Reply Posted: 25 Feb 2017 at 4:43pm
	Is this the 6080 you have in your name or some other model?
	He who says there is no evil has already deceived himself The truth is the truth, sugar coated or not. Trawler II says, "Remember that."

AC6080MAINE Members Profile Send Private Message Find Members Posts Add to Buddy List Silver Level Joined: 22 Nov 2016 Location: Maine Points: 60	Post Options Post Reply Quote AC6080MAINE Report Post Thanks(0) Quote Reply Posted: 25 Feb 2017 at 9:09pm
	Yes sir, a 1983 6080. I can set the plug down where it gets ground and see if the coil heats up.