[KyleKidd]

I'm thinking about addicting a small sub this summer when I refinish the hatch. I'm not going to add anything crazy, but I'm concerned I may not have a lot of power left to run a new system. I just installed a new ASP U/D pulley. This is in my 300zx N/a. I did however buy the TT alternator a while ago which has a little more power output than the N/a version.

Basically, I need to find out how much power I have left over, and if it's enough to add another amplifier to power a small sub. Obviously it would be at idle when the least amount of power is generated. I don't want to go and buy a new amp and sub-woofer if my current set-up cannot power it.

So is there a way for me to measure my output so I could calculate how much lee-way I have at idle?

 

[dreamteam]

Yeah, you can measure output with an ammeter.
YOu will need an automotive one that probably reads up to at least 100amps.
Got mine at Harbor Freight for cheap.

That said, you may want to consider running a big capacitor
or an auxiliary battery (garden type) to take the load off at idle.

 

[KyleKidd]

hm, I do have an extra cap over the garage from the previous set up. I'll have to see what its rated at.