I have a 1985 hmmvw with an upgraded 6.5 motor 1800 miles I bought it a month ago and haven't been able to Star it. the glow plug wait light doesn't come on at all. I've read a lot of posts and have done the ground harness I've changed the glow plugs and a new KDS smart box with a new matching TSU unit. Still not wait light I've metered the wait light have 24vdc. With the key in the wait light position I get 3.68 vdc to each glow plug. When I put my meter to the battery red lead on the positive and black lead to each glow plug I get 24vdc. I don't know what else to do or am I missing something. This is the fist post I've done. Read a lot and did a lot of things before I wrote this. Need some help.
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1985 Hmmwv
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tage
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Have you tried starting the truck?
Does the bulb flash, or even light up for a fraction of a second when you put it to the middle position?
Are your batteries charged?
Wait light burned out? LOL
Does the bulb flash, or even light up for a fraction of a second when you put it to the middle position?
Are your batteries charged?
Wait light burned out? LOL
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Ohm out all 8 glow plugs and report the results. This is resistance from the glow plug terminal to ground with the wire disconnected. If some or all are open, well there you go.
Action
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Did you disconnect the batteries before switching those items?
Dock Rocker
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To add make sure you disconnected your batteries while swapping the controller box. If you didn’t the new one is likely toast.
Also make sure you have 24v glow plugs and not 12v.
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Also make sure you have 24v glow plugs and not 12v.
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ikoinu
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So on attempting to start, it just cranks constantly with white smoke coming out? No white smoke will mean no fuel.
I just went over this with a fire engine that wouldnt start yesterday, and of course with my own 998.
My issue was cranking was fine, good batteries. Lots of white smoke, so fuelling was good. Tested my glow plug wires, constant 24v so my controller was bad, pulled a plug and ohmage was bad so plugs were burnt out.
I assumed plugs were bad because of constant 24v.
My fix was to wire up a manual controller.
If you are getting 3.68v while your wait light is on, then your controller is not sending voltage properly. The question is why?
I just went over this with a fire engine that wouldnt start yesterday, and of course with my own 998.
My issue was cranking was fine, good batteries. Lots of white smoke, so fuelling was good. Tested my glow plug wires, constant 24v so my controller was bad, pulled a plug and ohmage was bad so plugs were burnt out.
I assumed plugs were bad because of constant 24v.
My fix was to wire up a manual controller.
If you are getting 3.68v while your wait light is on, then your controller is not sending voltage properly. The question is why?
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