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84 CUCV Not starting

thunderboltthornton

New member
3
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Location
Tenneessee
Hello everyone, I'm fairly new to SS as far as my profile goes, but I've been searching this site for longer. The past 2 weeks I've been searching and searching over posts and threads about other members having starting issues with there truck and I've taken a lot of the advice and checked a lot of the things the members had problems with. So I really hope I don't get bashed for starting another thread about a CUCV not starting. I have literally been looking and looking for days about where to go next. I have looked through some threads from Warthog about the fuse box and fusible links and things like that. I do apologize for that but i do honestly need help.


To start out I have an 84 CUCV with the 6.2 diesel motor. It does still have regular 12/24v starting system. It has 47k miles on it. I bought the truck about April. Drove it from Kansas to Tennessee no problem. Every once in a while when I'd turn the key I would just get a click and no engagement at the starter. I would turn the key off then back to start and it would then proceed to turn over and then start. This didn't happen every time i went to start the truck but just every once in a while. Then one day i ran to the store maybe 4-5 miles down the road, I came out and tried to start it and just the click but when i turned the key to off then back to start i kept just getting the click. I proceeded to get under the truck and I tapped the side of the starter thinking this was the problem. Maybe coincidentally or not, not really sure but i got into the truck and it started right up. Then i had no more problems for about a week. Then it did it again only this time i tapped the starter and nothing happened. All it did was one click. Starter wouldn't engage.


Since then i have been searching on here and these are the things i have checked and done so far, first thing i took the starter off and had it rebuilt and starter solenoid replaced, also i did the doghead starter relay mod, i have got the batteries load tested and one of them failed so i replaced it, there is a ground on the back of the block (closest to the firewall) that was bad and also had a grounding strap from the block to the firewall. i replaced the grounding strap and put a new fitting on the ground. Today i took the instrument cluster out and dropped the steering column so i could get to the ignition switch. i hope i used the right terminology for the ignition switch. from the key on the column there is a rod on top that goes into a little box, (this little box i'm referring to as ignition switch) i took that box off and did what i shouldn't have done. i pried the bracket off the box that the rod goes into. And all the little connectors and springs fell out. So i went to O'riellys and found the part and it came up as an ignition switch. I thought the ignition switch was where the key goes so correct me if i'm wrong. But i did replace that part but i think its the wrong one because it works backwards. Instead of the key springing backward from the start position to the run position it springs forward. And it doesn't line up with the bolt holes which is probably why it springs the wrong way. But i did try to start the truck with this switch and still nothing.


So i do have 2 problems, I need to know how to get the correct ignition switch and also still have to figure out why it isn't even turning over. I've checked the ignition fuse and its good. All my fusible links (behind the batteries) are all good. I don't see any melted wires like other members have reported. Nothing burned up while i tried to start it and I've never had a runaway starter. I'm not sure if i'm at the point of just tracing down all the starting system wires or what. I would consider myself as a decent mechanic. I work on all my own vehicles. But i know i'm not the greatest mechanic. I am in the army reserve and my MOS is wheeled vehicle mechanic. I do have basic mechanic tools. Just a little background info about my skill set. I was hoping it was something simple but i'm not sure anymore and i do love this truck. Any help would be greatly appreciated. And thank you in advance for any help. Again i'm sorry for starting another thread about these problems but i have yet to find one which pertains to my certain situation and I've check mostly all the other places other member have reported.
 
Last edited:

joshuak

Active member
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Location
Slower shore, DE
snip... So I do have 2 problems, I need to know how to get the correct ignition switch and also still have to figure out why it isn't even turning over. I've checked the ignition fuse and its good. All my fusible links (behind the batteries) are all good. I don't see any melted wires like other members have reported. Nothing burned up while i tried to start it and I've never had a runaway starter. I'm not sure if i'm at the point of just tracing down all the starting system wires or what...
Welcome aboard from MD.

Yep, that's the ignition switch. Did you install it backwards by chance?

You can usually get the correct part for your vehicle by searching for parts for a 1983 k5 or k30, depending what variant of CUCV you have. Are you familiar with the Technical Manuals available for these trucks? You will find part numbers in the -20p and -34p editions, hint the part you are looking for is on page 126 of the -34p manual.

Tracing circuits might not be a bad option, beats guessing.

Have checked out the CUCV Helpful Threads section? You'll find great info. including wiring schematics.

The only time I've had intermittent no start like that, it turned out to be a loose wire at the 12v fuse block engine side firewall, I only discovered it after also replacing my ignition switch...:?

Have fun with your green iron and stay safe!
 

reaper556

Member
282
3
18
Location
HOCKLEY, TX
Hope you get it figured out and report back what it was. Maybe try breaking your wall of text down to readable paragraph's and I bet more folks will chime in as its really hard to read as it is.
 

thunderboltthornton

New member
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Location
Tenneessee
I didn't install it backwards joshuak. Thank you very much for your input. I am aware of the TM's and i have been using them but i haven't even searched the -34p TM yet. Thank you very much for that. Also i didn't know there was different varients of the CUCV, i thought most were all the same, so thank you for that. Thank you for your input also reaper556. I do apologize if my post is hard to read, i should have broken it up instead of one huge paragraph. First things first i will get the right ignition switch then try to trace down some wires. Thank you again. Will report back when i make some progress
 

joshuak

Active member
747
215
43
Location
Slower shore, DE
You are more than welcome.

Make sure to check out the CUCV Helpful Thread section, folks have gone above and beyond to share useful info. as well as organize and present it.

I second reaper556's petition, don't be afraid to hit the enter button and break up the text. Just makes it easier to read and understand.

Definitely post up results, good luck.
 

royalflush55

Well-known member
Steel Soldiers Supporter
654
537
93
Location
Reydon, OK
There is a difference in ignition switches for a non tilt column like our cucv's and a tilt column. Make sure it is for a non tilt column.

I would also make sure all wires at the starter are tight and the connections in good shape. Also check the connections on the 12 volt diamond on the firewall. Two of these have a fusible link. Pull on each of them individually to make sure they are not partially burned into. One of these feeds the ignition switch with 12 volts. If all the above check out ok then take the wiring harness apart where it goes thru the firewall and clean it with a contact cleaner and brush and look for any problems with the contacts there.
 

thunderboltthornton

New member
3
0
0
Location
Tenneessee
Alright guys, been working on the truck tracing wires and things. I've found a break thru. I'm not getting 24v to the starter relay from the red wire. According to people that have done the doghead relay the top red wire should have 24v. Also the ignition fuse socket prongs are not getting 24v either. I ran a jumper wire from the top of, (solenoid next to the diamond on the firewall, not sure what it is but I am getting 24v on the top of it) to the starter relay where the red wire is, and the truck started right up. I know the red wire goes to the fuse box where the ignition fuse is located. It also goes to the ignition switch. So the diamond on the firewall i'm only getting 12v (on the right side post) also. Not sure if thats supposed to be 12v or 24v. So my problem is lack of power but I'm not sure from where. The purple wire and purple and white wires on the starter relay are not getting any voltage either when key is turned or not turned. Any advice is greatly appreciated please
 
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