glow plug relay problem
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From: TAXACHUSSETTS
glow plug relay problem
I just replaced my relay on top engine as mine was not working.After installing a new one i,m still not getting power across the large studs.I am not getting ground to the back small stud on the relay,i,m am getting power to the front small stud.After manualy applying groung manually from battery i can hear relay engage.Where do i look next for cause of no ground at the small wire?Thanks in advance if anyone can help.Have checked all fuses and not sure what is going on.
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From: TAXACHUSSETTS
thanks any help is appreciated.If the small wire up front is controlled by a timer and shuts off after engine is running and temp is warm could i just run a jumper ground to back stud on relay.When the front stud power shuts down then the glow plugs would no longer be energized correct?Also i installed a GPR110 from napa if it matters.
Hotshot
Joined: Jan 2008
Posts: 13,144
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From: Rochdale MA
Theoretically yes.. The front ( hot) stud should have a constant +12V to it. The relay is energized by the PCM introducing a ground to the relay. I have seen a switch connected to ground on one side and the other to the small ground post on the relay to make it work.
Lead Driver
Joined: Jun 2004
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From: Amarillo, TEXAS!
Are you testing this on a hot engine? If the oil temperature sensor is reporting 132F or higher, the PCM doesn't activate the glow plugs at all.
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From: TAXACHUSSETTS
Both small wires are red one has blk heat shrink with yellow stripe.I was wondering if i put them back right also.The yellow stripe one is on the back small stud.
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From: TAXACHUSSETTS
The engine was fairly warm.I was wondering the same thing all so.It,s plenty cold now outside about 25F. and will fire it up at 4:30 am.Will let you guys know.I think this was the problem now that you mention it.
Cargo Master
Joined: Oct 2010
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The answer to your question in post 4 is no. One large post is constant 12v. The small 12v wire is keyed 12v and will always be on when the key is on regardless of the WTS light. As mentioned earlier, the small ground wire is controlled by the PCM (engine temp, timer, etc) and is the only thing that switches the glow plug relay off and on. IF you ground that small post on the relay as you described, it will always be on with the key on until the relay dies or something worse happens.
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