Keyed Ignition Switch Issues

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88atlas07

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Springtown, Texas
First time poster, long time lurker. I finally picked up my '98 m1078 from GP and one of the first things I want to do is to do away with the push button start and integrate the start button as well as the toggle ignition to a traditional keyed ignition. I ordered an lmtv ignition switch from one of part suppliers and it comes with the traditional BATT, ACC, IGN, and STR. I have BATT and IGN hooked up and everything operates as it did with the toggle BATT switch.

The original start button has 2 wires going to it. I connected the wire with power to STR and left the other disconnected as was shown on a Youtube video of Abel. All I get is a click from the fuse panel. It doesn't crank, but if I take the power wire off and ground it with the IGN on, then the starter engages.

I'm starting to think its a faulty ignition switch as I've tried every combination. Batt and IGN are good, just cant get the starter going.

Any ideas? Thanks in advance!

Patrick
 

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Ronmar

Active member
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Port angeles wa
No, it is probably OK. To cobine power and start together on an A0, You need a switch with two separate and distinct contactors. The power switch switches DC from CB70 to power the main relay K2. The start pushbutton provides a pathway to ground to energize the start relay.

if this sw is only capable of switching one source of power to different output contacts you will have to add a relay that the start contacts on the switch can energize, and whos contacts provide the same function as the original pushbutton start sw...
 
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88atlas07

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Springtown, Texas
That makes sense, so Ill keep the rocker switch for power and just use the ignition switch to take place of the start button. Thanks for the info!
 
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coachgeo

Well-known member
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North of Cincy OH
when I get around to it.... I'll just add a secret switch that breaks the ground (or Pos.) to the rocker switch. Rocker won't work without hitting other switch first. or just bypass the rocker switch to the secret switch. Got an easy to install simple hidden in plain sight idea... but don't want to announce publicly. If anyone is curious just PMme.
 

88atlas07

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Springtown, Texas
I should have researched this before going out and spending $75 on an "LMTV" ignition switch when the same result could have been achieved with a $12 ignition switch from amazon.
 
307
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Corpus Christi Texas
I should have researched this before going out and spending $75 on an "LMTV" ignition switch when the same result could have been achieved with a $12 ignition switch from amazon.
It's true for much of the vehicle unless you are doing some sort of authentic period correct vehicle.

From door handles to air conditioning systems, there are civilian alternatives.
 

19Detail

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Vermont
That makes sense, so Ill keep the rocker switch for power and just use the ignition switch to take place of the start button. Thanks for the info!
Just because I always think of the dumbest possible thing that I could possibly do, if you set it up that way, you could start the vehicle, remove the key and put it in your jacket, drive off without your jacket and stop the vehicle. Now you are stuck there until someone brings you the key or you disassemble the dash and hotwire the vehicle (easy enough to do, so Coachgeo's idea is also great).

Here is what I did:
LMTV Wiring 1.jpg
Doing it this way, the brake lights and turn signals are energized when you turn the key to on. I re-purposed the Ignition switch to be the headlights on switch. I also connected the 24v starter circuit to the 12v ignition circuit so it popped the breaker every time I tried to start the vehicle, but I don't like to talk about that...
 
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19Detail

Member
40
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Location
Vermont
20190717_204030.jpg

I removed the M series Light switch and replaced it with a flat piece of metal that I painted black. I also had to epoxy a notched plate behind the key switch so it would not rotate in the hole when I started it.

Also, just so I don't give the impression that I am anything other than a total hack, the truck side of the M series connector just has wires jammed into it and bunch of electrical tape around it (I tell people it is so someone can put it all back to original if they want, but deep down, I know why...)

20190504_123021.jpg
 

88atlas07

New member
14
2
3
Location
Springtown, Texas
Just because I always think of the dumbest possible thing that I could possibly do, if you set it up that way, you could start the vehicle, remove the key and put it in your jacket, drive off without your jacket and stop the vehicle. Now you are stuck there until someone brings you the key or you disassemble the dash and hotwire the vehicle (easy enough to do, so Coachgeo's idea is also great).

Here is what I did:
View attachment 783766
Doing it this way, the brake lights and turn signals are energized when you turn the key to on. I re-purposed the Ignition switch to be the headlights on switch. I also connected the 24v starter circuit to the 12v ignition circuit so it popped the breaker every time I tried to start the vehicle, but I don't like to talk about that...
Very cool idea, especially given the fact if there's a way to screw something up, Ill be the first to find it. I like the idea of wiring the turn signals and brake lights to the ignition switch, I've already forgotten a time or two and took off with no lights. Ill look into doing something similar once I take care of all the little issues this truck has....long list.
 
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