# How To Wire An Amp Meter?
**URL:** https://community.electricforum.com/t/how-to-wire-an-amp-meter/1657
**Category:** Scooters, Bikes, Sagways
**Created:** [July 12, 2011, 10:59pm UTC](https://community.electricforum.com/t/how-to-wire-an-amp-meter/1657 "2011-07-12T22:59:21Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@Gregski](https://community.electricforum.com/u/Gregski)
#### Post date: [July 12, 2011, 10:59pm UTC](https://community.electricforum.com/t/how-to-wire-an-amp-meter/1657/1 "2011-07-12T22:59:21Z")
I haven’t finished my motorcycle conversion yet but I am close so I figure I’ll ask ahead of time. How do you wire an amp meter. I will have a 48 volt system with a 200 amp fuse 300 amp controller, 300 amp motor (peak). I know I need a shunt, I plan on getting a 200 amp one, but how do you wire it up.
I am guessing the shunt splits the positive wire coming from the battery probably after the fuse using the two bigger bolts on the shunt. Then do I just connect the amp meter to the two small bolts and Bob’s your uncle? Or do I have to wire it to something for power. The meter I am looking at has four wires, Blue, Green, Black, Red.
The Blue and Green say input, I assume those go to the shunt’s small bolts. The Black and Red are positive and negative for 5 volts of power, where do I get the power from, I will have the stock 12 volt battery in the vehicle as well, do I wire it up to that?
Please be gentle, I am learning.
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### Author:  [@insane.nick](https://community.electricforum.com/u/insane.nick)
#### Post date: [December 2, 2011, 2:35am UTC](https://community.electricforum.com/t/how-to-wire-an-amp-meter/1657/2 "2011-12-02T02:35:10Z")
I’d recommend that you do not install an amp meter on your e-bike.
I say this because amp meters:
1. Often require excessive wiring.
2. Can be unsafe in the event of a meter failure (this can not only harm your e-bike power system, but you as well.
Having said this, I’d just go with a voltmeter.
BTW, I’ve seen a number of cars and trucks that had to be towed into the shop because of bad and/or failed amp meters.
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### Author:  [@MrSparks](https://community.electricforum.com/u/MrSparks)
#### Post date: [March 24, 2012, 1:21pm UTC](https://community.electricforum.com/t/how-to-wire-an-amp-meter/1657/3 "2012-03-24T13:21:46Z")
Actually fitting an ammeter should not pose any risk to the system but you need the correct type.
Use a Hall Effect current sensor to replace the bridge between 2 cells, Allegro Microsystems ACS758ECB-200B-PFF-T is a 200A part stocked by Farnell for about £6,
It comprises a short thick copper element with an integrated Hall Effect sensor that produces a linear output voltage proportional to the current. The Hall effect sensor is electrically isolated from the copper element which makes the installation very safe.