Ok, ok, I know that once, in a former software version, I was indeed a senior member but this early first gen KSB still has me flummoxed up. I know this is kind of a but I'd like the KSB to work as intended. I just went out to the truck and had no voltage at KSB wire w/key on (50ish degrees, hasn't run in two days). There is no voltage at either wire in the connector that goes through the throttle mount bracket. When I unplug this connector with the key on, the wait to start light flashes continuously. Funny thing, when I unplugged it, the KSB had voltage! Where do I start chasing this thing down?

Greg

 

Power comes from the shutdown solenoid, goes to the thermal switch in the head, then goes to the KSB solenoid. The old trucks like yours use a coolant temp sensor, I think it shuts off at 120 degrees but don't hold me to that.

 

Thanks, Dave. After all the threads I looked through today, that has made the most sense. Now I've got a place to start. So, the shutdown wire should maybe have a splice further up the way to feed the switch? The solenoid on my new pump only has one male spade terminal.

g

 

That might be a difference on the old trucks. On the intercooled trucks there are two spade lugs on the shutdown solenoid, it acts as a junction. Maybe the KSB is just not hooked up right now? You'll have to ask one of the non-intercooled guys if the old ones are set up like the newer ones, I've never been under the hood of a non-IC truck.

 

Greg, I just re-read your first post - you unplugged the sensor for the grids, not the KSB switch. THe KSB switch (on non-intercooled trucks) is on the underside of the head, aft of the fuel filter.

 

Actually, my original pump had two spade terminals. I'm beginning to think I'm missing a wire somewhere. Still blows my mind that there was voltage at the KSB when I unplugged the switch. The way it's supposed to go finally makes sense in my small mind (must have forgot some other stuff and made room...). I'll try and tackle it in the morning before it gets too warm.
g

 

underside of the head? I thought just the gauge cluster sender was back there, or is it forward of that?

 

Now you went and made me dig out the Cummins book.
The switch is just behind the filter. It should open at 160 degrees. Sounds to me like you just need to get a piggyback spade connector and you'll be back in business, though.

 

Thanks for the extra effort, Dave ---I know those FSM's are heavy

 

Greg,

My shutdown solenoid does have a spade connector as well with just one wire to it. The non-ic trucks only had one wire to hold up the solenoid. From what i understand, the new ones have two wires on the shutdown solenoid because ones intially opens with 12v, then after the truck is started the other takes over with <12v (around 9v i think......). Our trucks just have 12v to the solenoid at all times.


I'll have to look at my ksb wiring, and for that matter...test to see if it's even working.....

Wannadiesel......you don't know what your missing never being under the hood of a non-ic'd (at one time ) truck.

 

Let me know what you find, Jeff

I'll save you the suspense, Dave. What you'll find under the hood of a non I/C truck is a LOT OF HEAT!

greg

 

Quote: "I'll save you the suspense, Dave. What you'll find under the hood of a non I/C truck is a LOT OF HEAT!"

 

Ok, I tore into the harness and can't find squat. The only thing in the head behind the fuel filter is what I believe to be the sender for the temp gauge in the cluster. It's a single purple wire. The wire that was connected to the KSB is blue with a white trace. I followed it all the way to a 6way connector that then ties into the harness that goes from one side of the firewall to the other---arrrgh! I can't find any switch in the head at all except for the one that runs the grid heaters and the (I think) fuel heater. I want this to work more on principle than anything else--I'd like to take a series of photos for my gallery once it works so there's a step-by-step photo archive for others struggling with this little deamon. So, blue wire with white trace goes into the harness---then where? What switch triggers 12v to it, and where is the darn thing? I'm gonna dive back in with the test light this afternoon...hopefully I'll have an update by evening.
greg

 

The non intercooled trucks have a different KSB system on them than the later trucks. Yours has a long, skinny KSB solenoid and not the short stubby one, correct? If so, it works backwards from the later ones. It should have no power to it when cold, then after the engine heats up, it will have power to it.

When it is powered, it will heat up a wax pellet inside it, and after a minute, will retard the timing 5 or so degrees. The later ones are electromagnetic, and when powered, will instantly advance timing 5 degrees.

 

So if we leave the KSB unplugged, we get a 5 degree advance? Maybe i should put a switch on the KSB wire