72 TR6 Starter problem

[CMaster808@aol.com]

My starter problem,

I have put in 4 differant starters and selanoids, all 4 have worked for maybe
a day,
then right back to sounding like a selanoid not pulling in, motor runs on all
4?

Any ideas as to what the problem may be?

Have jumpered streight to the selanoid from battery to no avail.

Have tried almost everything ?

Chet