still having troble starting need help
Postmaster
Joined: Mar 2008
Posts: 3,255
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From: Sweet Home, OR
I've said it before and I sound like a broken record BUT........my '86 will NOT start unless the glow plugs are functioning or the block heater is plugged-in.
As Dave said you should notice the glow plugs cycling, they draw about 20 amps. You should be able to tell through a gauge, lights dimming, fan speed decrease or something when they cycle.
As Dave said you should notice the glow plugs cycling, they draw about 20 amps. You should be able to tell through a gauge, lights dimming, fan speed decrease or something when they cycle.
Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 15
From: Nutter Fort, WV
When mine did that I cut both of the orange wires close to the connector on both sides, then soldered them together and covered with shrink wrap tubing.
If you have to pull the engine, you can unbolt the wires from the glow plug relay.
The other wires in the connector usually are not affected, just the glow plug circuit.
Where you run into trouble with using a meter to figure out power to glow plugs, the meter uses almost no power to measure voltage.
The glow plugs draw 200 amps, so any weakness in connections will show up as less power transmitted.
If you have a helper, hook the glow plugs up, then have the helper turn the key on while you are measuring the voltage, glow plug connector to battery negative would be a fine place for the meter set to DC volts.
I just replaced my original glow plug relay this fall.
It did still click, but it was not carrying full current to the glow plug circuit.
If you have to pull the engine, you can unbolt the wires from the glow plug relay.
The other wires in the connector usually are not affected, just the glow plug circuit.
Where you run into trouble with using a meter to figure out power to glow plugs, the meter uses almost no power to measure voltage.
The glow plugs draw 200 amps, so any weakness in connections will show up as less power transmitted.
If you have a helper, hook the glow plugs up, then have the helper turn the key on while you are measuring the voltage, glow plug connector to battery negative would be a fine place for the meter set to DC volts.
I just replaced my original glow plug relay this fall.
It did still click, but it was not carrying full current to the glow plug circuit.
Postmaster
Joined: Mar 2008
Posts: 3,255
Likes: 0
From: Sweet Home, OR
I've said it before and I sound like a broken record BUT........my '86 will NOT start unless the glow plugs are functioning or the block heater is plugged-in.
As Dave said you should notice the glow plugs cycling, they draw about 20 amps. You should be able to tell through a gauge, lights dimming, fan speed decrease or something when they cycle.
As Dave said you should notice the glow plugs cycling, they draw about 20 amps. You should be able to tell through a gauge, lights dimming, fan speed decrease or something when they cycle.
Thread Starter
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Junior User
Joined: Aug 2008
Posts: 90
Likes: 0
ok dave thanks i def did that. and there wasnt any drop in power i was still t]getting 12 volts to the glowplug connector. i have a friend who works in electrical stuff and he said that im getting power to the glowplugs but they arent using it he helped me through when i tested my resistance on the plugs and he says he thinks they are burnt out cause the circuit had no resistance. hes not a diesel person but he works in electrical stuff. i just ordered new bosch plugs today. ok if your glowplugs are left on for 10 minutes what are the odds that they will fry if they are brand new with less than 20 starts on them?
Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 15
From: Nutter Fort, WV
Given the normal on time is 10 seconds or so, 10 minutes is 600 times to long so I would say 99.999%.
Remember they are red hot in less than 10 seconds.
At 12 volts and .5 ohm's resistance each plug draws 24 amps.
That times 8 plugs is 192 amps.
When you get new plugs, if the relay clicks and the lights don't dim, my next place to look would be the relay.
I have manual control of the relay, so when it was failing I would have to keep hitting the button till the volt meter dropped.
Yes current was going through the relay every time I hit the button, but not full amps to heat the plugs.
Remember they are red hot in less than 10 seconds.
At 12 volts and .5 ohm's resistance each plug draws 24 amps.
That times 8 plugs is 192 amps.
When you get new plugs, if the relay clicks and the lights don't dim, my next place to look would be the relay.
I have manual control of the relay, so when it was failing I would have to keep hitting the button till the volt meter dropped.
Yes current was going through the relay every time I hit the button, but not full amps to heat the plugs.
Thread Starter
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Junior User
Joined: Aug 2008
Posts: 90
Likes: 0
ok guys i got the glowplugs today and after i installed them my truck started right up no problems so its fixed now thanks for all the help
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Moderator
Joined: Jan 2001
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From: Virginia
Keep an eye on those glowplugs and see how long they last.
Laughing Gas
Joined: Mar 2006
Posts: 1,083
Likes: 1
From: Fitzpatrick Alabama
You will be much happier if you go to O'Reilly Auto Parts (only parts store that still carries MotoCraft). Motorcraft is the best, they will not burn out, a lot of times Bosch will burn out in a few weeks, Autolites and Champions are the worst.
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