can i get a second mortgage on my home with bad credit

Depends on what you mean by "bad". Generally, need to be 620-640+ for any option (depending on the reason for the low scores), and likely if you have at least 25% or more equity above what you owe. If your scores are lower than that any 2nd mortgage would most likely be through a finance company - not a good idea unless you really need the money in a bad way. With a 600+ score I could possibly refinance into a FHA mortgage and get cash out up to 85% of the current value, less the current mortgage pay off and your closing costs.