Are you talking about a "high torque" starter?

Picture provided by Drudis @ Corral.net/forums

I put a '99 V6 starter on my '88 due to my bigass stock starter slowly dying from heat soak and killing my battery. When I replaced the starter I had to run a wire from the new starter's solenoid to the starter solenoid on the firewall. I remembered a friend's '93 Mustang GT having this solenoid on his firewall so I bought one for my car from Advance/Discount Auto Parts. GP Sorensen part # SS94 which has this second terminal at the bottom (I'm pointing at it in the pic).

 

ahhah! mother f-er we kept on using the original ignition one on the top post. We finally found the short though, bitch was hiding good. I'll tell Tim he's been working on it for 3 days and got it set up after jump the clutch relay I'm sure he'll be real happy haha thanks much though!

See a thread like this should be kept in some how-to file for everyone else that has this. Yeah he just wanted to lose some weight because his old starter was a beast.