Tach Problem - 20 kOhm Resistor

[AndyC]

After a long cold winter and a bunch of other stuff, I am just now getting a chance to pull out the 1995 speedster project that I started last year.

My starboard tach was not working, and I never got to the bottom of it last year, but I did do some troubleshooting. I swapped the signal wires from the port gauge to starboard and the gauge worked, so no issue there.

I was suspicious of the stator and rectifier, so tonight, I did a stator test and it was reading good. I am ready to replace the rectifier for other reasons (battery not charging and visible damage inside the rectifier) but decided to try a few other test points around the tach.

I tested the resistor between the stator and the gauge and got an open circuit on starboard, and 20k Ohms on port, so I know that no signal is making it from the starboard stator to the tach.

So since the resistor and associated wiring does not seem to be commercially available as a replacement part, is this something that I can just fab up from things I can find on amazon or radio shack? Seems like it would be easy enough to replace.

Any advice would be greatly appreciated

 

[AndyC]

FYI. Found a 10 pack of 20kohm 1W flameproof resistors on Amazon for about 85 cents. Overkill is underrated. Replaced the resistor, and the tach is back to working.

there was nothing special about the OEM Part. it was a normal 1/4W resistor hiding inside of some heatshrink tubing.

Just figured I would close this one out in case anyone else runs into this later.

 

[Dr Honda]

glad to see it's working. FYI... I never heard of the line resistor going bad on the tach wire. Good catch.