Do old links from my own unrelated subject websites improve or hinder my rankings?

[WhitbyHolidayCottages]

Several years ago I placed links on two of my other websites I own and control one my old company about CCTV installation and the other one is the official website for actor Sir Roger Moore.

The links are going to my holiday cottage letting website http://www.endeavourcottage.co.uk/ and at the time I wanted to improve my rankings with these links which are still there. The vast majority of my other inbound links are natural and are on other people's websites with some diversity regarding the anchor text. So my question is the old links on these unrelated subject websites which are also stored on the same web hosting company causing a problem and would it be beneficial to remove them to leave them in place?

Also several years ago I set up two other websites at the same hosting company also promoting holiday cottages in the same place thinking I might have more bites of the cherry, but they've produced very little traffic and are not ranked at all well, but they do links to my main letting website, could these because in a problem?

My domain authority seems to be equal to some of the companies which are higher placed for the short tail keywords on page 1 of Google and they have less inbound links, although they are usually bigger companies and I know many things which influence rankings.

I am trying strategies to improve the rankings, which have dropped to a small degree over recent months.

[WhitbyHolidayCottages]

Thank you for your quick reply, I was watching the whiteboard Friday about links and I know these websites are not spam links in the sense that they been placed on rubbish websites just for the sake of linking, but all the websites are controlled by me and I'm sure Google realises the common connection and I just didn't want the opposite of some kind of penalty because the subjects are completely different of each website and I made the links etc.

I appreciate your comments and I will place some text pointing out the connection from each website back to my holiday letting website

[kayintveen_MD]

Will it help, sure it will get your site more attention, and rank probably a little better, but due to the lack of relevancy don't expect the world of it. But if they are your own site, maybe you could create a page where you talk a bit more about the relation between company X and Y and then link to it to make the relevancy a bit better.