70HP 1995 stuck in S.L.O.W

[jetcar123]

1995 3 cyl 70HP stuck in SLOW mode. All tests in service manual check ok and problem points to Power Pack. Note on last page says: if all test ok before changing power pack test Diode in harness tan wire.
Diode shows HI res in one direction and Low in the other but only for a split second then goes high. Simply current flows in one direction only for a split second the goes open. Tried 4 dealers all NIS, pn 0583898, need it yesterday. Is current diode working normal?, can I use a diode from Radio Shack?
Thanks

[highcountry]

Take the diode to radio shack and let them do a check on it, they can match it with one of theirs.

[jetcar123]

Problem fixed

Radio Shack could not match the diode but I found one at a dealer after a lot of phone calls. Diode and power pack fixed problem. Thanks for the help!