what kind of cable are you running from the battery to the solenoid? where abouts is the solenoid mounted?
you could have a bad cable somewhere, or the incorrect cable, and its got too much resistance in it.

the best cable to use for a trunk battery setup, from rear to front, is the type used in car audio. big 0 gauge, tiny strands. almost no resistance.

 

when i hae the inside light on and all the other lights everything dims quite abit when i turn the key, but i dont see the ground problem, i just checked i, cleaned it and all

 

like amp wiring?

 

put a volt meter on your battery and have someone try to crank it over and watch the volts there. then do the same on the solenoid battery connection, then the other side of the solenoid.

see whats going on where.

 

you can't see ground problems.....you test for them...ie voltage drop test with a volt meter

 

i had this problem a few weeks back. turns out my batter cables were garbage. they might look good, but you'd be surprised. I took some jumper cables and jumped the solenoid to get some life. problem solved (after i fixed the cables, of course..)

 

just doesnt make any sense, the car was fine last week after i put the starter in, then i let it sit for 2-3 days and this happens lol. ok i went and got a multimeter, where do i check for a bad ground? battery and solenoid?

 

ok i checked the battery and solenoid, with the cables on the battery it reads 12.1 volts and when i got someone to try and start it it read 10.1 volts, then i put the cables on the solenoid and it read 11.5 volts, got someone to turn the key and it completely died to .1 volts lol

 

try some jumper cables in the mix, too!

 

the cable from the battery to the solenoid is most likely the problem then, if you've checked and cleaned all the grounds.