Newbie M-5 trans. electrical questions: Blown fuse

[Sean Jackson]

Hey everyone, 

First off let me apologize if this has been covered already. I searched the forum and shop manual and couldn’t find the info I needed. 
 

Just joined the forum a couple months back and have been lurking since my new purchase of a 1948 Windsor. 
I just got it on the road yesterday after sitting for a few months during snow (salt) season. 
The transmission was operating normally yesterday, shifting exactly as it should, but today it was acting odd. Yesterday I found that the kick-down wasn’t working in drive-high when I floored the pedal at about 35 mph. Got home and found that the plate on the throttle linkage wasn’t depressing the switch on the carburetor. I adjusted linkage and it’s now pressing the switch as it should. 
I switched the ignition on and was surprised to not hear the normal click from the relay... took it for a test drive anyway to see if my fix worked- no dice on the kickdown, and the car didn’t want to downshift automatically when coming to a stop. I had to put it in neutral and back into gear to get it to take off in 3rd instead of 4th (sloooow). 
I began electrical tests that are listed in the shop manual, and after two steps found that the relay fuse had blown! It was in good shape yesterday, I had pulled and inspected it. 
 

What might have caused that fuse to blow? The car has been rewired recently (and very neatly) and I see no bare connections that could’ve grounded. 

Thanks for any input,

-Sean

[Plymouthy Adams]

ther than a fluke...accident while adjusting your switch with possible power on....you tell us....if it pops another, do the math with ohms law and see if you have an existing problem.

[Sean Jackson]

19 minutes ago, Plymouthy Adams said:

ther than a fluke...accident while adjusting your switch with possible power on....you tell us....if it pops another, do the math with ohms law and see if you have an existing problem.

Will do. I don’t have any more on hand so I just ordered a box of them. Will check back when I get them, thank you. 

[greg g]

The imperial club web site has good info on semi auto trans in their repair section including the tech training sessions If you are old enough to remember film strips in elementary school they have the training strip to follow along with.

Edited May 27, 2021 by greg g

[Sean Jackson]

It looks like it was a fluke, odds are I accidentally shorted something without first disconnecting the battery (oops). The relay and solenoid are working as they should now with a new fuse. 
Thanks!