hi i have a base face sub and amp combo in a bmw e46 convertible the earth wire came out didnt touch anything i put it back on and worked but had to place it back in the terminal that fits on the amp and when i put it back in just the red warning light came on checke dfuses on the sub amp combo from what i can see the main power fuse on the wire is fine with the bad weather my battery went flat last few days as didnt move the car i have charged the battery now there are no lights but when i connected the live wire it sparked as if there is power getting to the amp any ideas please many thanks for any help i get mike