2nd Battery

i dont have any pictures yet as my wires are in a big ball of mess still right now.. i'll tidy it up this weekend and post though.

wiring the stinger was a snap though, run one wire from the main battery to it, one wire from it to new battery, a small ground and a small remote turn on wire and i was all set. i used 4 gauge for the power wires and fused it to 80 amps. i DID still manage to run my main battery low one day after several hours of leaving the car on but that was probably because i wired the remote to a NON-ignition wire, meaning the stinger's relay was triggered even though the car wasnt running, only in the first key position.

i've got a
http://img.photobucket.com/albums/v3...at/rt1180x.jpg

and a yellow top optima

works spot on

Quote:

---

Originally Posted by Serfio

but with the diagram abowe if the tank battery is drained out i can't start the carpc also if the engin is running..isn't so?

do I need another switch to power the carpc from 2nd battery ONLY when the engin is off and when the engin is running switch back to main battery?

Can you post me a diagram? I'm not an electronic..

Thanks

---

this is my $2 setup, fuses near car, pc batteries and PSU not shown. the PC battery is disconnected from car battery when you turn car off (ACC off), and during engine cranking (some cars may not disconnect during cranking).

Code:

---

                  +------+
          ACC ----| coil |----- GND
              85 +------+ 86   
                                              +------+
 Car Battery ----+      +-----------------+---| PSU  |
              30  \    87                |  +------+
                  \                      |
                                        PC
                                      battery

---

Check this thread http://www.mp3car.com/vbulletin/general-mp3car-discussion/74124-battery-recommendations.html

Quote:

---

Originally Posted by ming

this is my $2 setup, fuses near car, pc batteries and PSU not shown. the PC battery is disconnected from car battery when you turn car off (ACC off), and during engine cranking (some cars may not disconnect during cranking).

Code:

---

                  +------+
          ACC ----| coil |----- GND
              85 +------+ 86   
                                              +------+
 Car Battery ----+      +-----------------+---| PSU  |
              30  \    87                |  +------+
                  \                      |
                                        PC
                                      battery

---

---

I cannot understand the meant of these numbers
85=?
86=?
87=?
30=?

Can you (or somebody) explain me What they means?

Thanks

those are the terminals on the standard 5 pin relay... look at one & you'll see:)

ouch! ...thanks, I'm really a noob :)

Quote:

---

Originally Posted by Pandaman72

I have pretty much the same thing, sorta like this -

http://i28.photobucket.com/albums/c2...wer_Supply.gif

http://i28.photobucket.com/albums/c2...er_battery.jpg

Works a treat, I can leave the carputer running when I just slip into the corner shop etc, and even if I forget it is on, it will not kill the cars battery.

Panda

---

What is the purpose of the diode?

The purpose of the diode is to keep the secondary battery from discharging into your cars battery or accessories. Iv been doing some research on powering my PC this way and I only have two unanswered questions left;
one: Will these work?
http://www.allelectronics.com/cgi-bi...gi?item=GC-217
http://www.allelectronics.com/cgi-bi...?item=1N1190AR
two: Will this setup help regulate the power (i.e. keep it around 12v both during crank and normal operation)?

Quote:

---

Originally Posted by romanman69

What is the purpose of the diode?

---

What P3D4T0R said, it stops the backup battery powering the car.

Panda