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| Most users ever online was 902, 10-29-2011 at 04:09. |
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01-18-2009, 09:34
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#1 (permalink)
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Sergeant
Join Date: Jan 2009
Location: lemont illinios
Posts: 56
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M-818 pre heater problem
The preheater on my m818 doesn't work. If the spark plug is bad will this cause the light on the dash not to work? I had two trucks and neither worked and my friend had his pre heater stop working.
Any help will be appreciated, gary
gary@halftracks.com
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01-18-2009, 09:52
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#2 (permalink)
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CPL
Join Date: Dec 2004
Location: Bagram, Afghanistan
Posts: 5,253
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Really G102.. I have a M813A1 and you really think that little glow plug is worth a ****? Even when working its like peeing on a forest fire.
So anyway The light should be on, check the bulb step #1. test if there is power to the GLOW plug step #2 take out the GLOW plug and test it. step #3. If still not found problem it may be the switch. Just start at #1 and work your way around. I'm sure you will find the problem why its not working. But stated above might be a deal breaker lol
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01-18-2009, 10:00
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#3 (permalink)
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4 Star General
Join Date: Apr 2005
Location: Gravette Ar.
Posts: 3,865
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The pre heat is 12Volt, It has one wire that hooks to one bat make shure that it is hooked up and is hooked to 12 volt only.
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01-18-2009, 17:52
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#4 (permalink)
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2 Star General
Join Date: Oct 2007
Location: Franktown, CO
Posts: 637
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If the circuit is wired correctly and intact, 12V, the light should come on whether or not the glowplug is working correctly. My M818's glowplug had a broken element. the light on the dash still came on. Also found that when I picked the truck up from GL, the cold start circuit was wired to 24 volts which is incorrect. As stated it should be 12 volts and the wiring diagram decal on the underside of the battery cover, the one that serves as the right side cab step, shows which battery it should be hooked too and without looking I think its the rear left battery as you look at them.
__________________
US Navy 1976-1996
MVCC Treasurer & Webmaster "mvcconline.org"
1972 M818 "Optimus Prime"
38' M971 van trailer
1970 M35A2 "Snake Eyes"
1951 M37
M105A2 trailer
M101 trailer
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01-18-2009, 18:20
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#5 (permalink)
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2 Star General
Join Date: Oct 2007
Location: Franktown, CO
Posts: 637
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I was right the power for the 12 volts comes off the rear left battery's positive terminal. The circuit number is 569 and is hard to follow in the diagram but check my finger pointing to the terminal and the single wire coming off it is the power source for the glowplug. Tha may be another decal for Gary to tackle.
__________________
US Navy 1976-1996
MVCC Treasurer & Webmaster "mvcconline.org"
1972 M818 "Optimus Prime"
38' M971 van trailer
1970 M35A2 "Snake Eyes"
1951 M37
M105A2 trailer
M101 trailer
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01-19-2009, 08:18
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#6 (permalink)
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Sergeant
Join Date: Jan 2009
Location: lemont illinios
Posts: 56
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Thanks Deuce for the pictures, I will take off the battery cover today and check it out. I had two of them from TN. and neither of them worked. who knows they may have been disconnected. If it was installed on the vehicle I would like to have it working even if it's not a huge help in starting but with the cold we have had in IL everything helps, Thanks for the help, Gary
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01-19-2009, 10:56
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#7 (permalink)
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4 Star General
Join Date: Mar 2006
Location: Columbia, SC
Posts: 3,565
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With the weather being in the low 30's here in sc my 818 will not start without the clod start assist. I'm glad mine works. saves a lot of cranking on the starter.
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01-19-2009, 11:57
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#8 (permalink)
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4 Star General
Join Date: Apr 2007
Location: Ocala, Florida
Posts: 1,203
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Nice I did not know it needed to be 12v I think mine is wired for 24v I guess thats why mine doesn't work. Thanks Vinny
__________________
1970 XM818w/winch 16.00x20's- dropside bed
2009 M109RV trailer(custom camper) with tandum 16.00x20's
1985 M1009(Wife's)  Lifted 37" & 12bolt H1 rims
1989 M116A3
1970 M105A2
1984 M1009 *SOLD*
1967 M105A2*SOLD*
1970 XM818 BOBBED w/16.00x20's*SOLD*
1966 M332 *SOLD*
1968 M105A2*SOLD*
19?? M54A2*SOLD*
vinny-socom1@hotmail.com
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01-19-2009, 13:57
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#9 (permalink)
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Moderator
Join Date: Jan 2005
Location: Meadows of Dan, Virginia
Posts: 9,929
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Here is a link to a PS magazine note on this subject:
http://old.steelsoldiers.com/index.p...view_photo.php
__________________
Bjorn
MEP-018A (needs new generator head)
Avatar: XM757 in OK prepared for 1,000 mile trip home. Part of 6,000 mile journey in 2006.
1968 M49A2C modified with 1960 M756A2 truck bed and 1975 HIAB 765A knuckleboom, exhaust brake and more. (SOLD)
1969 Ford XM757 8x8, 5-ton Pershing 1A truck tractor...the "improved MV".
"Some things can't be made better, just differently......a lot of things actually"
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01-19-2009, 15:33
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#10 (permalink)
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Sergeant
Join Date: Jan 2009
Location: lemont illinios
Posts: 56
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I checked out the battery box and sure enough the wire was connected to the 24V battery. I changed it to the 12V. side and the light works and I could feel the manifold getting warm. I didn't try spraying and fuel at this time. Weird part is I took a test light and it didn't show any power or light up. Thanks to everybody for the help and the decal location. I never noticed it before. Gary
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