Starter Relay FXR

[hogpipes1]

I  picked up a 86 Fxrc barn find sitting sense 2014. Fresh gas , battery to start with. Fires up a few times then click click click. It's  the start relay.
 I have a few in parts dept. Put a new one in fire's up and issue taken care of.some of my relays have a diode in the circuit terminal 85-86.I have a good fact sheet on the different between with &  w/o the diode in the relay. Can't find the lnfor.right now. So I need a update on any issues using either one ? This FXR had the relay w/o a diode
THANKS.
 


 

[hattitude]

I am an electronically challenged person. But I can usually follow directions and/or advice..

Here's what I was told..

With the older HD relays, the system relay had a diode, the starter relay did not.

The system relay with a diode, dissipates the voltage spike when the relay is shut off, from back flowing into the circuit and damaging any sensitive electronics like the TSSM/TSM or ECM on EFI bikes.

Apparently that isn't a concern within the starter circuit.

As long as the relay is properly rated for the circuit's amperage, having a diode doesn't hurt anything... but NOT having the diode in a circuit with sensitive electronics, could cause an issue.

I was told for testing purposes, swapping relays is OK, but don't leave a starter relay in the system circuit for longer than necessary to test if the relay is the problem.

If I am remembering this wrong, or was givien poor info.... I welcome any corrections..


I did a quick check and it seems the replacement relays for the #31506-79C starter relay (original is unavailable) all seem to have a diode in them now. Based on what I was told, this shouldn't cause a problem as long as the amperage rating for the relay is correct..

[smoserx1]

Yes that is my understanding too.  The diode is only required to suppress the backfeed where the backfeed would damage an electronic device like an ECM.  A diode or standard relay can both be used anywhere a regular one was used such as in the starter circuit where the backfeed would not matter.

[hogpipes1]

A little late getting back.Nothing fancy in the start circuit to need a diode,but the new one has it and good to go.Always get the right info here.TKS.