Turn sign (flasher) is not working when engine is running…

Hi guys, I have been struggeling with an issue for a long time a nobody seems to can help me. So im hoping somebody here have the answer :-)

I installed a new Altenator from March performance (P595) and also new LED taillights from Digi-tails and along with this a LOAD flasher as the leds do not pull as much power.

So everything works PERFECT when engine is off, but as soon as the engine is on the blinkers do NOT flash, they light all the time.

Digi-tails told me to try to install a 10 ohm 25 what resistor from grond to the signal wire of both sides - that dont help. then they told me to install a radio capacitor instead - that did not help either.

I did talk to March performance about the alternator and he voltage that it charges with is correct.

I disconnected the AMP gauge like the attached drawing. Any ideas guys?
Author: Jetman