add delay in startup service

Hello,

We have a Windows 2012R2 failover cluster for our mailserver (no MS) environment.
We have a generic service role installed.

But now we have the problem that it starts the service too quick.
Al dependencies are loaded and it starts right after that, but we would like to add a delay for about 5 seconds before starting the service.

This is because the service has some problems finding resources when it's started directly (don't know why tough).
But when I reset the service right after it started, everything works just great.

So the question is: can I add a delay in the startup process of a generic service?