Glow Plugs Not Working

RTR

Well-known Member
As some of you probably have read, I have freshened up the 424 Diesel and installed new glow plugs (original style unforturnately). I didn't know about the conversion at the time. Anyways.....I also installed a new oem style glow plug push button switch. I made sure all wires were good and connections were clean, tight, and bright. When the key is on and the button is pushed I noticed that the indicator on the dash didn't heat up and investigated further. I then jumped the two wires between the glow plug switch and then the indicator heated up (smoked too) rapidly. By jumping the glow plug switch I didn't even need to have the ignition key on. The tractor started instantly with me letting it heat up for approximately 5-6 seconds.

Now why would the glow plug switch not be working? It is a new switch and when tested with a test light, one terminal has "hot power" and one terminal does not. Now in theory, when the button is pressed the other side of the terminal SHOULD be hot but it is not testing that way.

#1) Could I have gotten a bad, New switch?
#2) Could the wires be hooked up backwards, or would it matter?
#3) Does that switch require to be grounded through the dash?


mvphoto28151.jpg


mvphoto28152.jpg


mvphoto28153.jpg


mvphoto28154.jpg


mvphoto28155.jpg
 
#1) Could I have gotten a bad, New switch?.... Yes!

#2) Could the wires be hooked up backwards, or would it matter?.... Doesn't matter.

#3) Does that switch require to be grounded through the dash?.... No.

If I understand you correctly, when you jumper between the two terminals on the switch the glow plugs heat up, but don't when the switch is depressed. IMHO, you have done a good job of diagnosing a non-functional switch.
 
Hi RTR, looking at your photos, it looks like you have the glow plugs wire correctly in series. Just make sure that every jumper
wire between glow plugs have an insulator between the jumper wire that goes to the next plug. The jumper wires used to be made
with small and large loop holes and the large holes would only fit on the inside of the glow plugs.

Re switch, the switch has to be able to carry about 40 Amps of current as the glow plugs are rated at .9 of a volt and 40 amps.
The resistor indicator on the dash drops about 6V across it and the 6V across the 4 glow plugs when measured at the black wire
that connects to the first glow plug by the battery box. Some glow plug switches are only rated for low amps and actually
activate a relay that handles the high current load to the glow plugs.

Be CAREFUL when jumpering out the indicator or one of the glow plugs as putting 12V across the a glow plug or indicator will
make it blow the glow plug.

YTD Jdemaris link for replacement glow plugs: http://www.yesterdaystractors.com/cgi-bin/viewit.cgi?bd=farmall&th=959462

JimB
B 414 Glow Plug
 
Trow those things away and get the Bosch plugs. I changed my 364 over and I can't believe the difference. 15 seconds then hit the starter, it fires instantly. Around $50 for a set of 4at Rockauto.com
 

Thanks guys for the help. Those are the original copper wires on the plugs.....I just polished them with some rouge to make the look new. When I jumped the switch those glow plugs were on for about 5 seconds and instantly started the tractor with no problems. I'm going to keep it this way for now. Gonna go by O'Reilly Auto Parts tomorrow and pick up a 60 amp push button switch for it.
 

We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today.

Back
Top