When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
There is a procedure for checking. Search MSD's website. IIRC, you have to ground the white wire or something but its best to read MSD's FAQ. They can rebuilt it too. I just dont understand why its sparking on and off.