When I went to start up my car yesterday I turned the key and nothing happened. The lights all work.

It has done this one time before and it turned out to be a loose starter terminal.

Any ideas what it could be?

Thanks,
Eric

 

IMO I would be cleaning every ground I could find. That would include battery to chassis, engine to chassis,engine to firewall and so on. When cleaning these it means taking them apart cleaning and scrapping put back together with new bolts.

 

Agreed, also check your batt cables for corrosion or rust [at the battery and ending terminals]. Even then [at times] if the terminal end is corroded, it could also mean that there could be corrosion under the vinyl jacket itself (within a few inches of the terminal). I had that issue before, filed all of my grounds, replaced batt cables and no more problems.

 

I had a problem like that couple of months ago, turned out my problem was the battery cable running under my headers were to close to them and burned half way through. I didn't find it at first because of where it was, just didn't see it till i run my hand down the cable.