[makowalski7587@icloud.com]

When you say activating after 3 to 4 hours of cruising, do you mean the lights at the dash only come on then?  Not really sure what issue your having.

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Found the engine room temp getting too high and setting off the fire supression sys. Tank is located too close to the turbo on the port side bulkhead. Added ventilaion to the engine room and relocated the tank to aft centerline. Problem solved.