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Old 05-22-2002, 04:48 AM
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Post AMP METER HOOK UP

I AM BUILDING A 33 KIT CAR THAT I AM MAKING A STREET ROD OUTOF BUT I DO NOT KNOW HOW TO WIRE THE AMPMETER. THE DONOR CAR IS A 78 MUSTANG.IF I ASK THE PURLOIERS IN FL. WERE I GOT IT I GET BS I CAN`T UNDERSTAND.

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Old 05-22-2002, 06:47 PM
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The ammeter is wired in series in the circuit. The best way to wire it and the way I did it on my T-Bucket is to run a wire from the battery post on the alt to the (+) post on the gauge and then (-) post to ground. This will put the gauge on it's own circuit. Also run heavy wire with this I use 10 gauge. After that you should be set.
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Old 05-23-2002, 12:39 PM
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Gcomer3 - the circuit you describe sounds more like a volt meter circuit that an ammeter. An ammeter should be spliced into the wire from the + battery/alternator to the auxillary post on the ignition switch. This way the current used by all of the lights, radio, blowers, etc., will be measured.
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Old 05-23-2002, 08:05 PM
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I double checked my wiring and were both wrong. I knew I shouldn't have trusted my memory. I should have check befor I posted. Anyway, here is the way to hook it up and yes I double checked my T Bucket. The Battery post (hot) on the Alternator goes to the (+) post on the ammeter. The (-) post on the ammeter goes to the starter solenoid where the battery (+) cable goes. I told you wrong by saying to go to ground when you actually go to the pos battery post or pos post on the starter. I hope this clears everything.
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Old 05-23-2002, 10:48 PM
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Whew!!! That was close.

Al here with AutoReWire.com

Amp meters are always wired in series withing the charging circuit. In other words the way gcomer3 describes the circuit in his second post. If you wire an amp meter to ground it will short out and destroy the meter and fry the wire. Becuase amp meters are wired directly to the battery the wire on both sides of the meter is always HOT. Make shure that you use at least a 10 gauge wire with a generator, and should you choose to use an amp meter with an alternator use at least an 8 gauge wire. I've repaired a lot of fried wire on amp meters.

Volt meters are wired in a seperate curcuit (not in the charging circuit) They are normally wired between the ignition switch and ground so that they only work when the key is on and they don't drain the battery that way.

General rule is use an amp meter with a generator and use a volt meter with an alternator.

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[ May 24, 2002: Message edited by: Jon ]</p>
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Old 05-28-2002, 03:27 AM
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Thanks OK I will use a volt meter seing how I cot a alt., A voluminous thanks to you all. Now if I CAN find a job. -)
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Old 05-28-2002, 01:27 PM
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to: al at autorewire.com, can i email you direct there sometime? i'm putting in a painless fuse panel i have to wire myself, am using stock ammeter found in the 55 chevy truck instrument cluster and have to run the #8 wire from my battery straight to my ammeter, then to the panel, ig.switch etc. right? i.e. same as stock, si? don't remember how the alt. is hooked up. used to be a one wire, then something blew up, courtesy of gates enterprises in bellingham, wa, now it's a two wire, where do they go?
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Old 05-29-2002, 09:10 AM
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sorry, i said 55, which was a 6 volt truck, mine is actually 56, which was 12 volt. anybody know if the 55 second series was 12V?
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Old 06-13-2002, 03:12 PM
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Howdy

Al Campion again with AutoReWire


bullheimer you may call me anytime you like at 209-481-6496 or e-mail me with your number and the best time to call you and I'll call you.

al

sales@AutoReWire.com
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Old 06-22-2002, 12:34 AM
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Red face

In Europe the general example on how to wire an ammeter is this:
Consider a "T" shaper diagram, with the battery at the bottom of the leg, the alternator on one side of the "T" bar and all the car's electrics on the other side of the bar.
ALT _____ Electrics



Batt
With the ignition switched on, and engine NOT running, the battery is supplying all the juice. Electric current flows UP.
With the engine running, the alternator is supplying the juice, and electric current flows from the alternator to the electrics
(left to right)
You fit the ammeter on the vertical leg of the "T",
ALT _____ Electrics

Ammeter

Batt
so that the gauge will read "discharge" or "-" when the battery is supplying more current than the alternator can (i.e., engine off, radio on);
OR, the gauge will read "charge" or "+" when the alternator is recharging the battery (i.e. after you've started the car and drive off);
OR, should read more or less "0" with the engine running, and the alternator supplying all that's needed.

As for wire gauge, consider you're actually using the wire that goes from thr "+" pillare on the battery to the ignition NOT to the starter motor (which can be as thick as a baby's wrist)

It's quite normal for the gauge needle to whip left or right for an instant when you turn things on or off.

Cheers,
Morris
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Old 05-01-2003, 11:13 PM
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Mpescatori,
In theory that is a great way of putting it.
But, in reality

Battery-----------Ammeter------Alternator
!
!
Loads

When the car is off, the battery powers the loads.
When the car is on, the alternator powers the loads and whatever current that doesnt go to the loads, charges the battery.

Nemo,
You want to be able to read all the current that the alternator is putting out. That is why you connect it here.
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Old 05-01-2003, 11:17 PM
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Sorry about that, the "Loads" are supposed to be in between the Battery and Ammeter.
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