Installing a volt meter. Where to attach wires inside car?

B

buliwyf

Member

:

2002 Mazda Protege5, 2014 Mazda3 sedan

• Nov 7, 2014

• #1

I'm trying to install a small volt meter to the dashboard of the car (I use a phone mount/charger in my cig lighter). I was wondering where's the easiest 12V + and - wires inside the car to access?

I suppose also the cigarette lighter wires?

 

P

pcb

The Diagram Dude

:

2002 MP5

• Nov 7, 2014

• #2

OR,...

You could get one of these ($30) and use an actual smart phone with the Torque App. in the mount.

,... Then you'll get a voltage reading as well as about 70 other useful data streams of info from every sensor on our car,...

 

B

buliwyf

Member

:

2002 Mazda Protege5, 2014 Mazda3 sedan

• Nov 7, 2014

• #3

pcb, what a good suggestion. Thank you.

Will this product work?

http://www.amazon.ca/dp/B0051DUVK0/

 

P

pcb

The Diagram Dude

:

2002 MP5

• Nov 7, 2014

• #4

They should all work (theoretically,... they are all made in China) ,... just stick to a Canadian shipper to avoid the Duty Police.

 

R

rit14623

:

2002 Mazda Protege5

• Nov 10, 2014

• #5

buliwyf said:

I'm trying to install a small volt meter to the dashboard of the car (I use a phone mount/charger in my cig lighter). I was wondering where's the easiest 12V + and - wires inside the car to access?

I suppose also the cigarette lighter wires?

Click to expand...

The negative/gruond can be connected to a solid metal location on the car's body.
The positive can be connected to the cigarette lighter plug's positive (if this turns off when the ignition is off).

 

B

buliwyf

Member

:

2002 Mazda Protege5, 2014 Mazda3 sedan

• Nov 11, 2014

• #6

I got my OBD2 yesterday and was able to set it up properly with my smartphone.

To my disappointment, my Protege5 doesn't have a Voltage sensor for the OBD2! Is this normal?

I tried the OBD2 in my Mazda 3 and it sees a voltage sensor

EDIT:
It wasn't showing in Torque Free. I since bought Torque Pro and there's a Voltage sensor now (voltage coming from the OBD port).

 

Last edited: Nov 11, 2014