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#1
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Testing glow plugs with charger
I have 4 old glow plugs from a 300D which may work perfectly. (one is broken) I've seen on youtube a way to test to see if they glow by attaching the positive lead from a battery charger to the threaded shaft, and the ground to the glow plug body.
I've done that will all my plugs, and none even get hot. Does this mean they don't work, or my battery charger is busted? The charger shows 12 Volts. I have continuity in all the plugs, so is there a reason to replace them considering that they will probably cost me $30-40 each at a dealership? THanks Mark |
#2
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I would check them with a well charged battery.
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My occupational hazard bein' my occupation's just not around... 1980 300SD 1980 300SD |
#3
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How many amps is your charger? Is it automatic?
-J
__________________
1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket Tesla Model 3. 205,000 miles. Been to 48 states! Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels. 2014 Cadillac ELR 2013 Fiat 500E. |
#4
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Quote:
Either you are not making good connection or your unit doesn't put out significant amperage. Power (watts) = [E * E] / R If it's 12 volts that's 144/R Let's pretend there is 1 ohm of resistance. Then you are holding ~ 150 watt light bulb in your hand. You'd know if it was on! |
#5
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With good current, a good glow plug will get red hot quickly.
-J
__________________
1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket Tesla Model 3. 205,000 miles. Been to 48 states! Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels. 2014 Cadillac ELR 2013 Fiat 500E. |
#6
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You don't really want to test 2 volt plugs with a 12 volt charger.
That could get expensive....
__________________
Palangi 2004 C240 Wagon 203.261 Baby Benz 2008 ML320 CDI Highway Cruiser 2006 Toyota Prius, Saving the Planet @ 48 mpg 2000 F-150, Destroying the Planet @ 20 mpg TRUMP .......... WHITEHOUSE HILLARY .........JAILHOUSE BERNIE .......... NUTHOUSE 0BAMA .......... OUTHOUSE |
#7
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I wasn't sure if it was the series or parallel glow plug.
Last edited by sjh; 08-07-2011 at 09:18 PM. |
#8
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If you have a newer "smart" charger, it will not put out power unless it senses a connection to a battery.
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Greg 2012 S350 BlueTEC 4Matic 2007 ML 320 CDI 2007 Leisure Travel Serenity 2006 Sprinter 432k 2005 E320 CDI 1998 SLK230 (teal) 1998 SLK230 (silver) 1996 E300D 99k, 30k on WVO Previous: 1983 240D, on WVO 1982 300D, on WVO 1983 300CD, on WVO 1986 300SDL 237k, 25k on WVO (Deerslayer) 1991 350SDL 249k, 56k on WVO - Retired to a car spa in Phoenix 1983 380 SEC w/603 diesel, 8k on WVO 1996 E300D 351k, 177k on WVO |
#9
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I have an older charger that has no settings. I don't know why they don't glow. I even sanded the contact points. I tested the charger leads with my voltmeter and it read 12 Volts.
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#10
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Are these the old loop style plugs? Did you check them with an ohm meter?
-J
__________________
1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket Tesla Model 3. 205,000 miles. Been to 48 states! Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels. 2014 Cadillac ELR 2013 Fiat 500E. |
#11
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I put the dial on ohms, and they read something like 6 or 7. They are the old style.
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#12
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those are 6 volt plugs. DO NOT ground via body of GP, that wont work.
Apply ground to the threaded stud, and apply positive to the small ring around the threaded shaft which runs into the GP. Helps if you use a thick buss wire and a ceramic insulator to test them...
__________________
1985 300TD Turbo Euro-wagon 1979 280CE 225,200 miles 1985 300D Turbo 264,000 miles 1976 240D 190,000 miles 1979 300TD 220,000 GONE but not forgotten 1976 300D 195,300 miles 1983 300D Turbo 175,000 miles http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg |
#13
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I they read 6 or 7 ohms, they are good.
What was wrong with the broken one? Loop was open?
__________________
Palangi 2004 C240 Wagon 203.261 Baby Benz 2008 ML320 CDI Highway Cruiser 2006 Toyota Prius, Saving the Planet @ 48 mpg 2000 F-150, Destroying the Planet @ 20 mpg TRUMP .......... WHITEHOUSE HILLARY .........JAILHOUSE BERNIE .......... NUTHOUSE 0BAMA .......... OUTHOUSE |
#14
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about 9 ohms is normal
__________________
1985 300TD Turbo Euro-wagon 1979 280CE 225,200 miles 1985 300D Turbo 264,000 miles 1976 240D 190,000 miles 1979 300TD 220,000 GONE but not forgotten 1976 300D 195,300 miles 1983 300D Turbo 175,000 miles http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg |
#15
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More or less.
Depends on the temperature and the meter.
__________________
Palangi 2004 C240 Wagon 203.261 Baby Benz 2008 ML320 CDI Highway Cruiser 2006 Toyota Prius, Saving the Planet @ 48 mpg 2000 F-150, Destroying the Planet @ 20 mpg TRUMP .......... WHITEHOUSE HILLARY .........JAILHOUSE BERNIE .......... NUTHOUSE 0BAMA .......... OUTHOUSE |
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