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Old 09-16-2011, 11:25 AM
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Starter Solenoid on my Glow PLugs

My glow plug relay went bad and I replaced it the other day with and old ford style starter solenoid. It is working fine so far. Will this hurt anything, or can I leave it like this forever?
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1985 F250 Lariat Extended Cab 6.9 Diesel C6 Auto 4x4 BW1345 D50 Sterling 10.25 full float with 3.55s 20 MPG (achieved twice, averaging 16.5) 39 degree 134a A/C
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Old 09-16-2011, 01:36 PM
Lazy K Lazy K is offline
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Not exactly sure what you are using but so long as it is rated for 200amps+ you should be fine.
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Old 09-16-2011, 01:41 PM
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I am using one of these.

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Old 09-16-2011, 02:05 PM
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What was it originally off? If it is just an old type fender mounted mounted starter relay then it is unlikely it would be rated for 200amps.
The problem with using a relay that does not have a high enough current rating is that, at some point, the contacts may weld themselves together. If that happens you would likely lose all eight glowplugs.
Check parts store listings for a glowplug relay for a 1986 F350 6.9 and it would fit and be rated high enough.
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Old 09-16-2011, 02:33 PM
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Its just a plain jane fender mounted relay for some 6 cylinder 60's ford. It is new though.

I thought these passed the entire amperage of the battery down to the starter on old fords. I was thinking they would be good to 200 amps or more. Maybe I don't understand how they work.
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Old 09-16-2011, 02:47 PM
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I know what you are saying about the old starters but that would only apply to the old starters with the Bendix drive. I think Ford dropped them in the early 50s but stand to be corrected.
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Old 09-16-2011, 04:49 PM
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a starter relay will not hold up for use as a glow plug relay. they are not designed to take the current required to fire the glow plugs and will burn out quickly.
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Old 09-19-2011, 09:14 AM
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I did a search on the topic of using a fender mounted style ford starter relay/solenoid for glow plug duty and I read back through about 5 years of posts. It seems like people are split about 50/50 on this. You can read over and over that it wont work, then there the guys who have been running that setup for years and recommend it to everyone. On other engines its common to use a starter relay and I know the 6.2 crowd does it.

Some guys say the GP circuit pulls 50 amps, others say 100, other say 200!

Some people say that the relay must be rated for continuous use but that really doesn't make sens either bc we only use our glow plugs for 5-10 seconds at a time.

I read that these relays are rated to 100 amps. I guess I will run it and let you know what happens. I will keep a pair of cutters on the dash in case I need to quickly kill that circuit in the event that the relay sticks.
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Old 10-20-2011, 10:08 AM
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I just wanted to give an update. My starter relay is still running my Glow plugs just fine. The truck is a daily driver and is started with glow plug assistance about 4 times a day on average. I will let yall know if the relay burns up. So far, so good.
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Old 10-20-2011, 10:17 AM
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i would be careful because i did the same thing with min and burnt the **** out of the relay then i got it worked on couse i didn't want to skrew anything else up but it worked for a while
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Old 01-06-2013, 06:22 PM
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I wanted to follow up on this again for anyone who is considering using a fender mount style starter solenoid in place of their glow plug relay. I have been running mine for over 15 months without issue. I regularly run my glowplugs for 10 seconds and have not had any issues yet.
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Old 01-06-2013, 06:22 PM
 
 
 
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