No Power to TIU

Not sure about the rev L but some TIUs have internal fuses.  You could take a look at those.  On mine they take 20 amp fastblow mini automotive blade fuses. 

All the TIU's have internal fuses except the original Rev. G.  Rev. L most certainly have fuses, and they can blow before a lower rated thermal circuit breaker trips.

I didn’t realize the aux power input was on a fuse.  Does it share the Fixed 1 fuse?  I hope its that easy.

I honestly can't say if FIXED #1 fuse being out would affect AUX power, never hit that situation.

@amtrack5899 posted:

I didn’t realize the aux power input was on a fuse.  Does it share the Fixed 1 fuse?  I hope its that easy.

I didn't realize you were using the aux power port.  I don't know if it has a fuse or if it shares one. 

Try disconnecting the Aux power and connect a transformer output to Fixed #1 and see if the TIU comes on ? 

I did try the 180 brick to the fixed 1 input and the TIU did not come on.  This afternoon ill take the TIU apart and ck the fixed1 fuse. I have blown and replaced these fuses before , probably just not to fixed 1 .  Ill post the results.

I just finished working on the TIU.  The fuse itself was not blown.  I checked the spades On the fuse with a meter for continuity . It was ok but the spades themselves at some black on them . I would assume that was from oxidation.  I did put a new fuse in the fixed 1 channel and it now works.

Thank you for all of the replys.

Rich R