Ignition Key Wiring

[Bilito]

I have changed the starter because it perished when the bendix failed to disengage, I also replaced the solonoid. Now I do not have power to the ignition key to turn anything on.
How does power to the key get there? Does anyone have a wire diagram for that?

[EngineerMike]

Bilito-
1) sounds like the battery cable(s) was/were not reconnected correctly, check that. Could be there was corrosion into the cable wire itself and that working things around might have busted off what connection remained that there is now too high resistance in cables or connections.
2) would help if you would post type of rig, year, type of chassis, etc. to get more targeted response.
3) Generally there has to be 12v to ignition switch to enable 12v to the solenoid to trigger the starter when you turn key to Start (which it sounds like you already know), and if you didn't disturb that ignition circuit, the problem is likely in what was disturbed that feeds 12v to the cockpit (could also be a new spontaneous problem, but not the way to bet until all recent work is verified correct).

[Bilito]

Quote:

Originally Posted by EngineerMike Bilito- 1) sounds like the battery cable(s) was/were not reconnected correctly, check that. Could be there was corrosion into the cable wire itself and that working things around might have busted off what connection remained that there is now too high resistance in cables or connections. 2) would help if you would post type of rig, year, type of chassis, etc. to get more targeted response. 3) Generally there has to be 12v to ignition switch to enable 12v to the solenoid to trigger the starter when you turn key to Start (which it sounds like you already know), and if you didn't disturb that ignition circuit, the problem is likely in what was disturbed that feeds 12v to the cockpit (could also be a new spontaneous problem, but not the way to bet until all recent work is verified correct).

It's a 1991 Silver Eagle with an OSHKOSH mc-fg SERIES CHASSIS, there is such a mess of wires under the hood and under the dash I am thinking if I just had a diagram with color codes that might help me to trace.

Without turning the key on, the power mirrors, and radio work. We have an intellitec power off battery disconnect system and discovered today that one of the relays does not shut off the coach batteries, it clicks but the power keeps going thru, gotta replace that but right now my major issue is being able to turn on the motor.

[wa8yxm]

The ignition key, depending on the maker, gets it's power from one of several locations.

1: The Battery positive terminal

2: A bolt, somewhere between the battery positive and starter.

3: A "Battery control center"

4: the battery terminal on the starter.

Odds are you messed up that one.


What is the year make and chassis of your rig, (not the rig but the chassis)

On a 2005, and I assume many other years, workhorse, under the "hood" dead center is a black box.. No marking that I noticed on the cover, It is a fuse box, At the bottom of this box are two brass bolts.. They should show 12 Positive relative to ground.

[Bilito]

Quote:

Originally Posted by wa8yxm The ignition key, depending on the maker, gets it's power from one of several locations. 1: The Battery positive terminal 2: A bolt, somewhere between the battery positive and starter. 3: A "Battery control center" 4: the battery terminal on the starter. Odds are you messed up that one. What is the year make and chassis of your rig, (not the rig but the chassis) On a 2005, and I assume many other years, workhorse, under the "hood" dead center is a black box.. No marking that I noticed on the cover, It is a fuse box, At the bottom of this box are two brass bolts.. They should show 12 Positive relative to ground.

It is a 1991 Oshkosh MC-FG Series

The battery poitive runs to a battery disconnect and then back to the starter solonoid.
Where the hot poistive connects to the solonoid there are two other small wires also on that solonoid bolt, they both disapear into a harness they vainishes into the frame.
Under the steering column there is a harness coming from it with a big plug which is full of diff colored wires.
The other end of that plug comes from a harness under the dash.
The column has controls for cruise control, directionals, horn, hazzard, and ignition. they all probably have diff colored wires. if I knew which colored wire goes to the ignition switch I could runa continuity check when I get that plug apart

I jumped a wire from the battery hot to the S terminal on the Start solonoid and I can crank the engine.