We just finished putting in a plate and springs,now the truck starts and dies.The shutoff solenoid goes up when cranking but drops when you let off the key. Have we screwed up a wire or anyone have any suggestions on what to check.Thanx

 

Check fuse #9 (Fuse Panel on left Drivers side of dash)since it must be good to power the "Hold" circuit of the fuel solenoid. A schematic of the start circuit is in this thread:

https://www.dieseltruckresource.com/...d.php?t=192652

The "Hold" coil of the fuel solenoid is on the Light Green/Black wire. Fuse #9 (10 amp mini-fuse) feeds that wire. Your fuel relay is good if the "Pull" circuit is working. You may be able to keep it running if you manually pull the fuel solenoid plunger up while cranking just to check. Fuse #9 is hot in the "Run" and "Start" position of the ignition switch.

 

Also make sure you did not accidentally unplug the hold relay back by the booster at the cowl.

 

The number 9 fuse is good.I still cant get power to the on circuit that holds the solenoid up. Can anyone tell me what wire energizes that relay that holds the solenoid up. Im going to just put a toggle switch on it.

 

Unplug fuel solenoid connector (3pin) and check for 12v with key "On" at lt grn/blk pin/connector.

Its the LT Green/Black wire (its that color from the fuse all the way to fuel solenoid) on the fuel solenoid connector. Check for 12v there with key "on" not crank. Either there is a bad connection or open circuit or 12v is getting there but solenoid is bad. The lt grn/blk wire goes from the fuel solenoid connector to S132 and then C126 and S114 and C133 and to fuse 9 and then to ignition switch.

You could verify there is 12v with key in "on" position at fuse 9 (both sides) or start at other end at solenoid and work back. If you have 12v at solenoid then solenoid is bad or loose wire...you figure it out.

 

Ck the fuse links on the driver batt

 

That blue fusable link at the drivers side battery supplies 12v to the fuel relay on the engine cowl which provides power for only the "Pull" circuit of the fuel shutdown solenoid thru energezing the fuel relay. That fuseable link must be good because the 'PULL' solenoid section is working.

The "Hold" solenoid section of the fuel solenoid goes to Fuse 9 which is Hot when ignition key is in Start or Run position. It then goes thru some splices in the wiring harness (S132) and connectors (C133 pin 30, C126 pin 1) to the fuel solenoid 3 pin connector pin A.

If the fuel solenoid is pulling up during cranking then the fusable link is good and the fuel relay is good. If what your telling me is true than the circuit for "Hold" is thru fuse 9 and thats what you need to verify at the fuel solenoid connector or somewhere along the way. This is assuming Fuse 9 is good.

You could try cranking and holding the fuel solenoid plunger up and see if it runs. If it runs with you holding it up, then that would tell you something is wrong with the fuel solenoid and/or hold circuit powering it.

Fuse 9 also supplies power to the Fuel Heater relay pin 2 (on engine cowl next to fuel shutdown relay) and pin 5 of Engine Diagnostic connector, PCM (C1-Pin A2) and the Heated Intake Air System Relays 1 and 2 and EGR Solenoid.

 

Thanx Dave I will get on the meter and check all those wires. I had to wire it up for right now ,we are getting hit with an Ice storm here in Ky so we have to get home. Thanx alot for helping me out.

 

Good Luck. I have my 97 dealer service manual with detailed schematics are locations of connectors etc..here and I'll help as best I can. As I understand it your whole problem is in the Fuse 9 circuit.

So did tie wrapping it up keep it running or did you jumpoer in 12v to the lt grn/blk wire? If you have any other symptoms let me know becuase it looks like your "Pull" circuit is fine.

 

BTW that fuel relay is not for the "Hold" solenoid but only for the "Pull" circuit according to my schematic and circuit description on my 97. There is no "Hold" relay. Power for the "Hold" solenoid only comes from fuse 9 when key is in Start or Run position.

 

Yeah i took some wire and wrapped around the lever and hooked the other end of the wire to something else and its going down the road right now. It sure looks like that fuse 9 circuit is the problem. I will put the meter on both lug of that 9 fuse and see if that circuit is still hot.

 

Thx for the Clarification, I had always mistaken there to be 2 relays. Looking now I see the other is for the fuel heater.

If I read that schematic right the fuel relay is more or less a copy of a latching relay? I.E. they do not want the fuel solenoid to come up when the truck is setting with the key on, but obviously they need it when the truck is to run.

 

It's more like the pull circuit takes a bit of force to to move the shutdown and requires more current. The relay isn't latching, just a regular one triggered by the starter motor.