Garmin Run heart rate monitor & Fenix 6.. how do i know the HRM is working ?

When you're running look under the watch. LED's are off. Plus HRMRUn data will come with the running metrics

Are you seeing things like Ground Contact Time in the graphs?

That shows whether the HRM run is providing the data

where would i see ground contact time please?

the watch LEDs also provide stress info and breaths per min.. so am i thinking the LED may still be on (even with the HRH connected)?

7926849 said:

where would i see ground contact time please?

Under "Training Effect" in your graph, the next item should be "Running Dynamics".  You don't have this information, so your data came from the oHRM and not your strap.

7926849 said:

the watch LEDs also provide stress info and breaths per min.. so am i thinking the LED may still be on

This data will come from the strap during an activity if pair with your strap.

To ensure your strap is connected, you'll have a flashing heart icon on the top of the watch face when you select the run app.  This heart icon will go solid once the strap is connected. If there no heart icon, the watch isn't detecting the strap and is using the oHRM by default.  I hope this helps. 

Yep respiration info etc comes from HRV and the connected strap

Apparently if you wear the HR strap upside down you get HR data but no Running dynamics, so either  the OP is wearing the strap upside down or it's not pairing - or it's not a HRM RUN or TRI

Here's some of the Running dynamics data as an example, with Temperature at the bottom as I always run with a Tempe sensor

the leds on Fenix 6 are still on with a HR strap - not like fenix 5 they went off there.

use it over a sleeve and you'll be sure it works