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  1. #1
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    Jan 2003
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    Middlefield, Ohio
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    265

    Intake heater grid circuit

    Does anyone have the text that explains the glow heater grid time vs. temperature? I am having one of these circuits made for my 4BT that now has a 6BT grid and shortened 6BT intake plate. I need to know the grid sequence for the "pre-heat" phase. I don't know if the circuit turns both heaters on for all temperatures below 59F or does it use one or two grids based on the ambient temperature.
    1985 Dodge Ram 4x4 Prospector shortbed with 4BT; 3" lift & Air bags, 3.55 gears; NV4500; 4" stainless exhaust, HY35W, Bosch 190's, 6BTA intake horn and heater grid, 6BTA air filter housing with K&N.

  2. #2
    Join Date
    Jun 2000
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    Tucson, AZ
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    168
    Looked in my Haynes manual for 1994-1998 models. . .

    Above 59*, no heat.

    15* to 59*, 10 seconds pre-heat.

    0* to 15*, 15 seconds pre-heat.

    below 0*, 30 seconds pre-heat.



    Post heat with the above three pre-heat cycles but no times indicated. Also, the book makes no reference to only one working at times--refers to both working each time. Hope this helps.

    Scott
    2001.5 3500 Cab & Chassis 4x4 HO 6 spd
    Commuter truck: '04.5 QC SB 4x4 Auto
    Spare truck: '03 QC SB 4X4 6 spd

  3. #3
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    Jan 2003
    Location
    Middlefield, Ohio
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    I do have the after pre-heat cycle information. It does, by the way, alternate between the two grids when in engine running mode. At least that's what my single page from the facory manual has on it. It may use both grids at the coldest temperatures. Not sure though.

    so it sounds like both grids are on in the pre-heat mode.
    1985 Dodge Ram 4x4 Prospector shortbed with 4BT; 3" lift & Air bags, 3.55 gears; NV4500; 4" stainless exhaust, HY35W, Bosch 190's, 6BTA intake horn and heater grid, 6BTA air filter housing with K&N.

  4. #4
    Join Date
    Dec 2001
    Location
    Torrington,CT
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    4,861
    I know the marine grids alternate.
    Current-05 1500 2wd Gasser V6 auto
    Ex-1991 (non-intercooled) D250 5 spd 152K miles. K & N filter/enhanced flow airbox, Isspro boost, pyro, and tach,16 cm, pump FW, 4" exhaust, Bully Dogs, Blaupunkt CD, Dead KDP, Frankenturbo,CGFP
    Latest dyno number...241rwhp/604rwt

  5. #5
    Join Date
    Oct 2000
    Location
    Maple Ridge, BC Canada
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    3,281
    Here it is right out of our manual. . . . .



    http://www.turbodieselregister.com/f...ad.php?t=31560



    pb
    Pastor Bob

    93.5 W250 4X4/CC,POD's,DTT 91%TC/VB/TRANNY,4" exhaust, Detroit Locker, new PDR R&D turbo w/flux capacitor, 373RWHP on #2 fuel, Stage 2 water/meth,AFC@100% custom cone, StarWheel topped, Valet switch,
    Timed@16*,K&N,Isspro-Pyro/Tach/
    TransTemp,AutometerBoost,Borgeson RS-9000's. Thanks 2 PDR & DTT.

  6. #6
    Join Date
    Jan 2003
    Location
    Middlefield, Ohio
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    Does it use both grids in pre-heat when at all grid active temperatures?

    In engine running mode do the grids alternate for the listed seconds until above 59F or is there any "no grids on" time during the cycling? That is, is there any off state in the duty cycle.
    1985 Dodge Ram 4x4 Prospector shortbed with 4BT; 3" lift & Air bags, 3.55 gears; NV4500; 4" stainless exhaust, HY35W, Bosch 190's, 6BTA intake horn and heater grid, 6BTA air filter housing with K&N.

  7. #7
    Join Date
    Dec 2000
    Location
    Junction City, Oregon, USA
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    1,746
    Yes both are used in pre-heat mode. Post heat mode can use both or alternate one then the other, depending on the temp. The FSM doesn't state at what temperature set point it will go to alternating. In the post heat cycle there are periods when both heaters are off. That is why your head lights & alternator gauge show normal voltage levels.
    Last edited by Paychk; 11-19-2005 at 11:03 AM.
    04 2500 Laramie Crew Cab Short Bed Stock 91,000

    92 D350 5 spd Getrag 3.54 Reg Cab Dually, Stock 192,000, Una-goose hitch, Pac-brake

    *** No affiliation with any company or product ***

  8. #8
    Join Date
    Jan 2003
    Location
    Middlefield, Ohio
    Posts
    265

    Post heat off

    Could you probably have the thermistor temprarily above 59F when both are off in post heat and have them come back on when colder intake air chills the thermistor back down below 59F? I don't see anything in the chart to otherwise explain this.
    1985 Dodge Ram 4x4 Prospector shortbed with 4BT; 3" lift & Air bags, 3.55 gears; NV4500; 4" stainless exhaust, HY35W, Bosch 190's, 6BTA intake horn and heater grid, 6BTA air filter housing with K&N.

  9. #9
    Join Date
    Jan 2003
    Location
    Middlefield, Ohio
    Posts
    265
    Ah, I see a Bossier City as an address. I worked for Schlumberger in Shreveport for some years.
    1985 Dodge Ram 4x4 Prospector shortbed with 4BT; 3" lift & Air bags, 3.55 gears; NV4500; 4" stainless exhaust, HY35W, Bosch 190's, 6BTA intake horn and heater grid, 6BTA air filter housing with K&N.

  10. #10
    Join Date
    Dec 2000
    Location
    Junction City, Oregon, USA
    Posts
    1,746
    The manual dosen't specify what happens if the thermistor goes cold again, quickest way to find out would be pull it from the intake, plug the hole and put it in water. Or if you have a spare sensor, once the engine is warm, move the wire from the engine to the spare in some cold water.



    I see the blue & white convoys all the time, coming & going across the Jimmy Davis. I bet you miss the winters down this way, I'm looking to move home to Oregon this next summer.
    04 2500 Laramie Crew Cab Short Bed Stock 91,000

    92 D350 5 spd Getrag 3.54 Reg Cab Dually, Stock 192,000, Una-goose hitch, Pac-brake

    *** No affiliation with any company or product ***

  11. #11
    Join Date
    Jan 2003
    Location
    Middlefield, Ohio
    Posts
    265
    Good idea on teh extra thermister. I do have a spare I can test with.

    Used to live on Preston avenue in Shreveport. Miss the fine food down there. Had many Dades while I was there.
    1985 Dodge Ram 4x4 Prospector shortbed with 4BT; 3" lift & Air bags, 3.55 gears; NV4500; 4" stainless exhaust, HY35W, Bosch 190's, 6BTA intake horn and heater grid, 6BTA air filter housing with K&N.

  12. #12
    Quote Originally Posted by driverswanted
    Does anyone have the text that explains the glow heater grid time vs. temperature? I am having one of these circuits made for my 4BT that now has a 6BT grid and shortened 6BT intake plate. I need to know the grid sequence for the "pre-heat" phase. I don't know if the circuit turns both heaters on for all temperatures below 59F or does it use one or two grids based on the ambient temperature.
    I was reading about the wait to start light and water in fuel lights flickering during grid heating being described as normal for gen 1. I just started having the flickering on and off. Found that when lights flicker, grid heater solenoid(forward one) vibrates because of worn. dirty contacts(shot). When it makes good contct, then lights do not flicker. Solenoids for grid htr are not available . . found them as western snow plow parts on the web (Mill Online Store) part # 256-0515 (need 2) at $10 ea. plus shipping. These appear to be the ones. . will let you know if they turn out not to be.
    Pete Fleming: My 92 longbed 4x4 CTD auto dogmatic and my wife's 2001 shortbed 4x4 CTD auto (that I steal every once in a while)

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