TN75DA electrical issues

[elkhurst1]

Hello all...

I have a TN75DA power shuttle machine that seems to have a few electrical issues.
When I start the tractor, the AC compressor pump, the AC fan motor, the four wheel drive, the radio and both windshield wipers won稚 work for 1-2 minutes, then it will all come on and work just fine. It痴 almost like a relay is starting to go bad but I can稚 tie all those items to one relay.
I致e checked all but 2 of the grounding points. Couldn稚 get to the cab roof ground and couldn稚 find the engine ground.? The others were all good.
When I was testing and shut the tractor off, 2 different times all those items (stayed on) for about 20 seconds after turning the key off as well.
All the other things seem to work ok tho....instrument cluster, lights, the ECM.
I did run my code reader and there were no codes other than a few old clutch potentiometer codes from a few years back that I never cleared off.
Anyone have any ideas?

 

[RickB]

I’d be suspicious of the key switch.

 

[elkhurst1]

I'll order a new one and let you know how it works.
Thanks Rick

 

[RickB]

That’s an armchair diagnosis from 300–400 miles away. Key switches are cheap and the only component that comes to mind when considering your symptoms. Good luck Gary. The email in my profile here is good if you need it.

 

[elkhurst1]

I haven't had much time to operate the machine until this week to be sure, but wanted to update my electrical issue as being fixed!
I did replace the key switch as an inexpensive first guess, but still had problems.
As I had time to investigate further, I discovered no power to 1/2 of the fuse box on the right side cab support. I removed the cover and found
4 more relays hiding just above the fuse box. I did a little more testing and discovered one was bad.
My local NAPA store carried the exact replacement. Problem solved!!!

 

[RickB]

Good deal.

 

[elkhurst1]

Thanks RickB,
I've dropped you a couple emails from this site, and they haven't went through....not sure why???

 

[RickB]

Not sure either. Let me check my profile.

 

[RickB]

The email in my profile should be good. I sent you one through this site just now. We shall see if it goes to you.

 

[elkhurst1]

Nothing! I looked through my settings as well, all looked good!