All;
I am finishing up installing a pre lubricator on my 93. I know many feel that these things are a waste of time, but the PO had it included with the truck (new in box, AMSOIL), and my rig sits for months at a time. I mainly use the truck to tow my 18' flatbed or boat.

Anyway; the instructions call for hooking the positive wire at the fuse panel, via a fuse tap. The positive wire is to go to a spot on the fuse box, which is not hot in the accessory position. The connection is suppose to be hot when the ign is turned on. Before I start checking the fuses with a test light, any suggestions on where to tap in? Ignition switch?

 

broncobilly

This is what I would do,
Install a 30-amp relay Bosch Relay under the hood close to your battery.

Term.#85 = Ground
Term.#86 = Fuel Solenoid Wire @ pump (through 1-amp inline fuse recommended)
Term.#30 = Battery (+) through a 20-amp inline fuse
Term.#87 = Connect the wire to your Preluber

By using a relay you will have the maximum available battery current delivered to the Prelube motor while sparing the ignition switch from having to switch the current and prolonging the life of your switch and wiring.

Now only milliampers are drawn from the switch instead of amperes.

Also there are no wires spliced into your truck wiring or unsightly and troublesome Scotchlocks to tap with.

How long does the Prelube system run, does it have a timer or turn off with pressure?
Jim

 

I would do as JIM suggests, except I would control it with a momentary push-button switch and not deal with any timer or such, just hook the push-button to an all-the-time HOT and not mess with the factory wiring system.

Push the button a few seconds, release and crank it up.

 

The power window circuit is not hot in acc.

 

Jim, Bear, and Dave,
Thanks for the input on my fuse block post! Jim; that's an excellent idea, wiring into a 30 amp auto relay!! I would of never thought of that Yes; there is a timer box which the pre luber is wired through. It can be set anywhere from 0 to 60 seconds. It comes set at 60 seconds from the factory. Bear; that is a good idea with the starter button on the dash! Anyway; thanks again for the help! I was always a little electrically challenged

 

Jim, Dave, Bear...,
I started to wire up the pre luber per Jim's above recommendation with the 30 amp relay. I am trying to figure out how to do this, with the timing controller box. The box controls the amount of time the pre luber solenoid is open (0 to 60 seconds).

Anyways; the pre lube timer box connection instructions dicatate:

A) Turn key on and use a test light on the fuse circuits, to select the best fuse to supply 12 volts to the solenoid valve. Make sure to select one that insn't hot in accessories position.

1) Run hot + wire from post #3 on controller box, through firewall and connect to the supplied fuse tap.

2) Connect hot + wire from post # 3 on controller to solenoid valve (valve on pre lube tank). (Either terminal on solenoid valve will work as positive or negative).

3) Connect ground wire from post # 2 on controller to solenoid valve.

4) Connect ground wire from post # 1 on controller to a ground on the vehicle.

So; basically the timed controller box has 3 posts. Two wires running off of post 3 (one to a supplied hot + source, second to the solenoid valve at pre lube bottle). One off of post # 2 (to neg at solenoid valve on tank). And a ground wire off of post # 3.

I am wondering how to wire the timer box into the 30 amp relay, as mentioned by jim? I have an idea; but thought I would ask, as I am electrically challenged

I figure from the 30 amp relay, terminal 87 would connect to post # 3 on the pre-lube controller. Terminal 86 would connect to fuel solenoid wire. Terminal 30 would be spliced into post # 1 (at pre lube controller) then grounded to metal. Post # 3 would connect at solenoid on pre-lube tank. Post # 2 would connect at solenoid on pre-lube tank. Maybe I am wrong here?

 

To wire it the way Jim says take the wire from terminal #87 and connect it to Post #3 on the preluber. no nee to run it through the fire wall.

Post #1 on the controller and terminal #85 on the relay can run to their own ground. No need to tie them together unless they are right next to each other.

 

broncobilly

This is how you would connect the Bosch Relay
Install a 30-amp relay Bosch Relay under the hood close to your battery.

Term.#85 = Ground
Term.#86 = Fuel Solenoid Wire @ pump (through 1-amp inline fuse recommended)
Term.#30 = Battery (+) through a 20-amp inline fuse.
Term.#87 = Connect the wire to your Preluber Post #3

Connect the controller per your instructions with the addition of Post #3.

Post #3 Wire to Term.#87 on relay AND another wire to the Solenoid terminal on Pre Lube Tank.
Post #2 Wire to NEG solenoid terminal on Pre Lube Tank.
Post #1 Wire to a good chassis ground.


Please do not let the following confuse you; it can ignored this if you wish.

If I was installing this on my truck, in addition I would install an annunciator in the cab to indicate when the PreLuber was actually in operation and delivering oil I would install an LED and a Chime.

If you were to install an LED you would need to insert a small 1-amp diode across the solenoid coil, (you could do this at the controller) the lead with the BAND would go Post #3 (+) with the other lead to Post #2 (-)

Now run 2 wires from Post #2 (-) and Post #3 (+) (you can use light 22-gauge wire) into the cab and install the LED and Chime where ever you desired while observing polarity.

You can get a suitable Chime from Radio Shack.

From the way it sounds, the adjustable controller is a Delay on Make timer, meaning once power is applied the timer initiated its timing sequence then will time out and wait for its next interruption and then application of power to begin the sequence again.

The timer controls the solenoid with a Ground signal to the coil.

Is there a pump in this system or it is simply an accumulator that stores pressurized oil, which is charged while the engine is running and bled back into the system being controlled by the solenoid valve?

I have some ideas for this design of my own.

I hope I did not confuse you more that you were.
Jim

 

Jim and OFCmarc,
Your help is greatly appreciated! I now know how to wire the relay, in conjunction with the adj timer control. Jim; the pre-luber I have has an accumulator tank - which; as you mentioned, stores the pressurized oil - which is charged while the engine is running, then (as you said) bled back into the system, controlled by the solenoid valve. The annunciator sounds like a great addition! I will have to add that at a later date. Right now I need to get the 93 back on the road! Again; I really appreciate everyone's input! I have always had a hard time reading electrical schematics