Jose 11 #1 Posted September 19 wheel horse 520H Why does the tachometer not work when engines is running, but only moves when you turn the key meaning just jumps… if anybody could help me with this situation thank you Share this post Link to post Share on other sites
bds1984 1,435 #2 Posted September 19 It is not receiving a signal from the A/C output of the charging coil. My 520H does that when it loses connectivity in a wire connector. I'd be checking your 9-pin connector and any other link in that circuit. 1 Share this post Link to post Share on other sites
Jose 11 #3 Posted September 19 I’m thinking maybe the piggyback connector to the I believe the B on the voltage regulator looks like it may be cracked and not getting a proper solid connection. that would cause the problem correct? Share this post Link to post Share on other sites
bds1984 1,435 #4 Posted September 19 The B terminal is DC battery voltage. Tachometer signal comes from either of the A or AC terminals and is alternating current. You need to verify connectivity of the tachometer to the A terminal. 1 Share this post Link to post Share on other sites
gwest_ca-(File Mod) 11,070 #5 Posted September 19 The tach signal comes from only one of the AC terminals. If one does not work try the other. 2 Share this post Link to post Share on other sites
Jose 11 #6 Posted September 19 I will be looking into that tomorrow thank you Share this post Link to post Share on other sites
Jose 11 #7 Posted September 21 (edited) Hey guys so when i looked further into the problem, I found that it was the piggyback connector that was indeed hair line crack. I replaced it and all good and the RPM/Tachometer is working as should!! Thank you Edited September 21 by Jose Share this post Link to post Share on other sites
