Turn the vacuum head on and keep everything still. At each junction try to find the short by pulling, twisting, etc. If the short is where the vacuum handle connects to the power cord from the brush, you will have to replace the wiring harness inside the hose handle. We have some Hose Handle Wire Connection Parts for some vacuum handles. If you are able, please test the continuity of the power through the hose. Otherwise, you may need to replace the power cord running from the brush into the hose handle, or the power head itself, if everything else checks out.