As you may remember I bought a voltage regulator for a B type generator. At the beginning the VR worked well and I sent you my appreciation for your help. Now I need your help again. The VR charges perfectly well for 1 or 2 minutes after being polarized, then it stops charging. If I re polarize it sometimes charges again. I also short circuited the Bat and arm post and it charges again, but always for a short time. I cleaned the VR contacts it responds but again the same behaviour. what can I do to repair it or do I have to request for refund?