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Us Ohio people must get up and post at the same time Steve...

Welcome Brit!

If your strong suit is electrical, you will be fine. Plan for Haspin. (search it).. Welcome...

[thumbzup] Great post mistaken!! I did all this math a long time ago, trying to figure out why the voltage would destroy the other plugs if one failed, the only flaw with the system though, is that this is only true if a plug fails “open” or at least a high resistance. Then the controller...

:ditto: Plus the timing of the misfiring of the cylinders really wear out the valves and piston bearings fast, as some cylinders are firing out of time while it is warming up. The hot plugs prevent this.

This is one of the flaws with the button bypass, I’m pretty sure most people don’t do this. There are a number of things the “post glow” or “after glow” time accomplishes, but one of the most critical is the prevention of excess engine wear that a cold start causes, preventing early engine failure.

I think opinions on the site, are pretty much split down the middle, and I’m sure you will get more opinions as to which to use. I think Wellmans are now Diesel Rx...what happened there? Did they get bought out or what?

If you think yours is a 24V, then you need to look for a 1N4749A

Low battery voltage. Loose/dirty/corroded connections. And another, I touched on in this thread: http://www.steelsoldiers.com/cucv/62606-86-6-2-glow-plug-module-repair-3.html Look at post #26

The zeners are very inexpensive. I have a bazillion of them laying around here. If you think yours is a 24V, then you need to look for a 1N4749A. Allied and I have a love-hate relationship, but that is a good place to get some things you cant find anywhere else. Be cautious of the minimum order...

Low battery voltage. Loose/dirty/corroded connections. And another, I touched on in this thread: http://www.steelsoldiers.com/cucv/62606-86-6-2-glow-plug-module-repair-3.html Look at post #26

Mine do :mrgreen: sorry...couldn't resist

:ditto: Don’t let the electrical gremlins scare you. I think everyone should have one.

Don’t waste your money, and don’t do the bypass unless its for a backup like Warthog said. . That is the typical Z4 failure. Look at this thread http://www.steelsoldiers.com/cucv/62606-86-6-2-glow-plug-module-repair-3.html post #26, I detailed why this happens. It is usually a simple fix. If...

Welcome from an hour or so north of you. Grew up in Columbus, and am there about every two weeks or so. Your geographic location puts you in great company. Many great members here just a short drive away.

18. "WAIT” LIGHT OPERATES UPON RESTARTING (ENGINE HOT) Step 1. Check connections at glow plug switch on upper left rear of cylinder head and glow plug module. If connections are not good, clean and secure all connectors. If connections are good, perform Electrical Troubleshooting malfunction...

On high quality industrial electronic circuit boards, they usually put extraction holes or handles on them . Take a look at the rear of the card, there are holes in it. These are meant to insert a tool into and remove. They do get sticky sometimes, and to use pliers or whatnot, can damage it as...

Welcome from a couple hours south of you!

The manual say they are supposed to be 1-3 ohms. Replace the set, and I think you will see your problem vanish. Starting is only the beginning for the glow plugs, they go through the “afterglow” cycle after the engine is running for more complete combustion among other things.

Because I will be walking him lead by lead through the board, I need to know details about how it is acting. I think it would be cooler to post results and procedures rather than the guesses. That being said, lets go over one of the most common failures and why it happens: The -20 manual says...