Engine/Transmission (1994 - 1998) Shut Off Solenoid

[SRehberg]

Larry, nice setup, D/C could sure take a cue from your design, but then again they'd have to spend 10cts. per truck to prevent the problem.

 

[LarryB]

OK guys, I have some done. They are on my site at http://fostertruck.com/sol-saverdiode.htm



Larry



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[Signal73]

Im not too familiar with how the FSS relay and starter are connected so they can backfeed, where about does that new diode come into play, does it mount to the starter, and the hot lead that would have been on the starter now bolts to the stud coming off the diode?? thanks

 

[LarryB]

Im not too familiar with how the FSS relay and starter are connected so they can backfeed, where about does that new diode come into play, does it mount to the starter, and the hot lead that would have been on the starter now bolts to the stud coming off the diode?? thanks

That's correct, it goes on the starter at the small wire that activates the starter. This same wire activates the fuel solenoid relay. If the starter sticks on and backfeeds 12v into this wire the fuel solenoid "pull" coil is activated.



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[Signal73]

Much clearer, thaks for the post...

 

[Howard Durand]

Keeping this thread alive, I am curious about the wire size between the battery and the starter. My service manual shows it as #6. The Haynes manual for 1994 through 1996 shows it as 00.

I haven't pulled mine loose yet to see the actual size of the conductor but I am inclined to believe it is 00.

Any thoughts?

 

[PKemp]

Howard: I just went out into the service shop. I have two 96's on the rack at the moment. We pulled the Batt to Starter cables off both and checked them against a wire gauge. They were both "00"... ...

Any prgress with the relay idea ??



Larry: Just ordered one from your site. I'll let ya know how it holds up... . :-laf

 

[LarryB]

Howard: I just went out into the service shop. I have two 96's on the rack at the moment. We pulled the Batt to Starter cables off both and checked them against a wire gauge. They were both "00"... ...

Any prgress with the relay idea ??



Larry: Just ordered one from your site. I'll let ya know how it holds up... . :-laf

Thanks PKemp, any feedback greatly appreciated. It'll go out today.

Larry

 

[Howard Durand]

The relay idea is still alive.



I bought a White-Rodgers 12 volt battery solenoid on e-Bay. It is rated at 200 amps, continuous duty, 600 amps inrush. It will be used as the auxiliary starter solenoid.



The diagram here shows what I want to do. (I should have used a little bit larger print for the labels).



The auxiliary starter solenoid will be in the line between the battery and the starter.



Turning the ignition switch to the start position energizes both the auxiliary solenoid and the fuel shutdown solenoid.

When the engine starts and the ignition switch is in the run position, the auxiliary solenoid will be open and the starting circuit will be isolated from the starter.



I would like to hear any thoughts or comments you might have about this idea.

 

[Howard Durand]

If you look at this situation from a practical standpoint, the best course to take would probably be to order a set of the big contacts and a diode from Larry, put them in and call it good.

I like the idea of being able to completely disconnect the starter from the battery but it may not be worth the trouble. Do we want to spend extra money to protect the starter from a possible failure that doesn't happen very often?

If so, a simpler way to protect it would be to leave the starting circuit the way it is and put a heavy duty solenoid in the cable. Wire the solenoid to pick up when the ingnition switch is turned on and, using a simple timing device, disconnect it after 30 seconds or so.

 

[PKemp]

Larry: Diode kit came today. Nice and clean looking. Will be putting it in on the weekend. I'll keep you posted on how it holds up.

 

[LarryB]

Larry: Diode kit came today. Nice and clean looking. Will be putting it in on the weekend. I'll keep you posted on how it holds up.

Just put it on and forget about it. That's how it should be, right? These diodes are so over rated for the application they should never cause a problem. That said, I'm sure sooner or later somehow something will go wrong for somebody. After all it's still a machine.

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[RyanB]

Pull Cable shut-down

Just wondering if anyone has a Part# for the cable shut down unit. I have heard guys using an IH part but am unable to get the part#



Thanks... Ryan