Tach issue need help

[Firestream]

Looking for a little help with a tach issue. I have an 05 Chopper DT with a tach acting up. I noticed the tach wasn't reading over 3500 and from 3000 to 3500 it took a really long time to hit 3500. I figured the tach board was bad (vibration), so I bought a new one and installed it. Tach still not going over 3500 with the same slow response from 3000 to 3500. I started checking wire connectors and everything seems fine. According to the manual the tach signal comes from the ign module to the EHC and then out to the tach. I checked the ign module and crank position sensor and everything is good. I could understand a wiring issue if the tach wasn't working at all, but it reads normal to 3000 rpm. Any ideas??? Thanks for the help...

 

[SF180A]

Firestream,

If you are able check all your wires for a short or a loose connection. I have an 03 and had a break in my left rear turn signal wire that cause my Tach and Speedo to slow and eventually stop working all together. I had two bike shops tell me it was EHC related before the problem was discovered and fixed.

SF180A

 

[Firestream]

I started checking connections from Ign. to EHC and then out through the backbone. Found one broken connector so far, but the wires were intact. I'm gonna cut, splice and shrink tube and keep working toward the tach. Funny, I sent BDM an email telling then I replaced the tach ring and what should I check next and they replied I should take it to a dealer!!! Dealer couldn't figure it out the last two times, so it's up to me!!!