Golw Plug Issues

Fergienewbee

Well-known Member
I have an IH 424 diesel. Yesterdays we worked all day figuring out an electrical issue or so we thought. We direct wired the glow plug start button to the battery and from the button to the indicator. Today, the indicator lights up but seems to pull so much juice that the battery won't turn it over fast enough to start. The battery worked fine yesterday and shows 11.9 volts with a tester. Any thoughts?

Larry
 
1. The battery is not fully charged.

2. ASSUMING you still have the OEM GP setup, are the 4 GP's AND the indicator in SERIES?

3. WHY are you operating the GP's AND the starter at the same time?

4. Consider converting to modern "pencil" GP's. Post back or check the archives for more info on that.
 
1. Battery is showing 11.9 volts

2. Glow plugs are in series and working.

3. Manual says to depress the starter button while holding the glow plug button down.

4. The plugs I got are the ones called for.

Larry
 
If that is the voltage while cranking, it is an OK voltage. If it is the rest voltage, nothing on, it is way off. voltage is 12.6 to 12.65 if fully charges and good. Jim
 
The originals will work fine, but all has to be in good order. Firstly it sounds as if you connected the glow plugs, and then connected the indicator?
The indicator and glow plugs must be in series, and they operate as one. That is when the indicator is glowing, the others will be too.
Make sure you have a good heavy duty battery. Firstly heat the glow plugs until the indicator is red. Stop the glowing and hit the starter immediately. It should start up no worries.
I have one of those little tractors and even in winter, it starts within a couple of revolutions. They are a good little machine.
Cheers,
Rx
 
11.9V means the battery is DEAD. It is either shot or needs charging.

A 12V battery has no useful charge left in it if it measures 12V or less at rest. Running it below that simply shortens its lifespan.

Charge the battery up or replace it. A good new battery should hold 12.8V at rest in warm weather, a little less in cold.
 
Rex;

Indicator is glowing red so I think I have them wired right. Have a charger on the batter now. We'll see if that helps.

Larry
 
With a properly charged battery and glow-plugs energized-voltage AT the battery should be over 12.5 volts. Those four glow plugs and indicator, all together only draw 20 amps total.

When the engine is cranking -normal voltage should drop to 9 to 9.5 volts. That is the voltage a "12 volt" starter is designed to work at.
 
Yes, the new Bosch Duratherm 12 volt plugs, wired in parallel, work MUCH better then the OEM system with four 1 volt plugs wired in series. NIGHT AND DAY DIFFERENCE. But the old system only draws 20 amps total. With the new plugs -it's close to 80 amps. If the guy has battery low-voltage issues now -it's just going to be worse with the newer plugs.
 
The original glow plugs will work fine. I start my B-275 Diesel in 20 degree weather with the original style glow plugs (brand new actual glow plugs). I work for a major battery company and can reassure you that 11.9 volts is dead. You need to get that battery up to 12.5v or above, I also put a group 31 (tractor trailer battery) in my battery box and it fits perfect. Not sure how your 424 is but I'm guessing similar?
 
Guess you have to define "fine." The original plugs are very slow, are NOT burn out proof, and if one goes bad - NONE will work.

The new upgrade plugs that Bosch makes let the engine get ready to start almost 3 times as fast. They are burn-out proof and if one DOES go bad, the other three still work. Even nicer, the new plugs don't cost much more then the original open-element low-voltage plugs.

So I guess if you say the OEMs are "finer", I guess the new plugs are "FINER."

190D Mercedes used the same glow plug system as the B414. The upgrade was made with the Mercedes cars in mind along with Unimog trucks. Work great in the IH B275s, B414s, and 3414s also.
 
I've got four IH tractors with the British BD144 and BD154 engines. I sometimes have to start them at below 0 F temps. My oldest engine has the CAV in-line pump and air-governor. That is the hardest starting tractor of them all. The other's have CAV rotary-distributor pumps with mechanical governors. Much better cold starters. I've had them 30 years and had many, many, burnt out OEM glow plugs. Mostly Denso, Lodge, or Champion CH28. I found no difference in quality with any of them.

When I changed over to the upgraded plugs made by Bosch - it made a night-and-day difference in engine starting and reliability. Do what you want but do not let anyone convince you that the old system is better. It certainly is not. Depending where you buy, the price is sometimes the same for the new fast-heat and burn-out proof plugs as for the old open-coil plugs.
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