power problems while car is running..
To start off, ill explain the setup:
I have a 12gauge direct connection to battery, rocker switch mounted in dash between battery/12v dc outlet, then from there it goes to the 12vdc outlet in trunk, then from there to my portawattz 140watt dc/ac inverter. The outlet is grounded, switch is grounded.. all should be good.. now,
I have a computer in trunk for music (ya im cheap, dont wanna buy a mp3 player so made it).. it will currently only run when car is OFF. If i turn car on, then try to turn on computer i get a fault light from the inverter. But i can turn it on when the cars not running and itll work fine. Computer power supply grounded, i am totally lost on whats causing it to fail when the car is running. I have a pretty new alternator (somewhere around 70amps SHOULD be no problem for this car (its a small 4dr/4cyl/4spd/4pass yes! its a 4x4! costed me $180 a few months ago..) so alternator shouldnt be problem... the battery is one year old, a Les Schwab XHD 5 year battery, constant voltage around 12.68 with everything (lights, ac, defrost, ect) running... 12.75 when nothings running.
Get a rock solid 15volts when car is on, 1/3 throttle gives me 17volts.. I hit switch for computer and inverter faults, but the voltage doesnt drop.. this has me thinking the need for a cap is eliminated since its not a drop in voltage causing it..
Also, if it makes a difference, the inverter itself does run when car is on (right now i have computer and a 3 piece speaker setup on the 140watt inverter. (no its not overloaded, cause it works fine if car is not running).. the speakers come on with inverter, but when i hit switch for computer to come on the inverter faults. Im confused!! Help! (i doubt its my alternator cause this one is a R/V duty alt.. should handle fifteen times as much.
Thanks for any help
-im kinda mad cause all i need is an AIWA or another good head unit with either rca or miniplug input (i aleady have coaxial audio ran from trunk to right beside my current blaupunkt rpd435 (can you believe they still sell these things for $160?!?! i bought mine nearly 2 years ago for $140 !! and they sell for $160 new now! haha.
ANyways i am almost done, just that it wont run while car is running.