fuses popping when going into overdrive?

[flatline]

I just put in new fuses in everything today and when I took off down the road, I was listening to the radio and when it went from (D) to (OD) the fuse for the radio popped, this was a 30amp fuse!

I changed the fuse and went down the road again, and it did it again when shifting to OD. So I changed it again and keep the selector in D and everything was fine.... So my question is why is this doing this only in OverDrive?

Trans is a 700R4, I looked for disconnected wires and found none, is there something wrong with my electrical system or is the truck surging while it shifts, either way this is not good, I have to have my radio.


* if anyone can help me out on this I would appreciate it.

 

[flatline]

anyone ?

 

[1979jimmy350]

that would most likley be your torque converter lock up causing that

 

[dyeager535]

Only thing I can think of is that it's a pressure switch that is screwed up, and grounding out inside the case. Lockup isn't a 4th only setup, so that shouldn't be the cause.

I would think disconnecting the connector on the drivers side of the trans, and checking the wires for a short to ground would be the first step. Since it only happens going into OD, leaving the connector unplugged, and going out and driving it will probably show that the problem is gone. Don't leave it unplugged, but it's a valid test procedure.

 

[darkshadow]

will it pop if you have it in od to start with?

 

[flatline]

will it pop if you have it in od to start with?

No, it only pops when shifting to OverDrive, it doesn't do it any other time. I will try to locate the ground, as I found another one on the interior light today.

question: is the interior/cargo light wired to the same fuse as the clock?

 

[Hobbes9112]

My 85 Jimmy is doing the same thing. Did you ever get the problem figured out?

Thanks!
Brian

 

[dyeager535]

If you don't get a response, pull the plug on the tranny, and go get it into OD. It's a 100% repeatable problem I assume, should reveal itself quickly if the problem is in the tranny or wiring to it, which it has to be I guess.