92 s-10, remote start problem

Hey guys, 1992 S10 pickup. There is no immobilzer or passkey or anything.  I've got a remote start problem.   It's an older model been working fine for probably 10 years or more. It's a Crimestopper system.  I think it's like RS-775 or RS 776 or something like that. Now sometimes when I hit the remote start button and it goes to start, it barely begins to crank then stops. After a second try it does the same thing and stops altogether.  The problem is that it's intermittent. Quite often it works just fine. It's acting like the starter wire isn't always getting the needed voltage. I was gonna try and put my multimeter on it and see what happens. The problem is as I mentioned earlier, it doesn't happen all the time. I'd hate to tear my dash apart and get into probing the wire and having it start just  fine especially since it's always cold around here.  The relay is on board so, I can't just swap it out. Have any of you had this or, have a good troubleshooting idea? As you can see by my post total, I'm not new around here so I should be able to understand what you are saying.

The truck never has any problems starting with the key so, it's definitely in the remote start system.