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Old 04-05-2003, 11:12 AM
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Post amp meter

could somebody advice me on how to wire up my amp meter ,its to go on a model A running a s/b chev on pretty basic wireing set up (ie) lights,and engine hook up.also could somebody clarify where i run the two wires from the alternater on the late model gm style,i have run the big one on the alt back to the starter but unsure where the two from the plug on the side go i think the top one goes back to the ignition switch ,befor i changed the engine i thought the lower one went back to the starter aswell,i tried this but the alt seems to get hot like this, so i guess thats wrong,all help greatly appreciated <img src="confused.gif" border="0">

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Old 04-05-2003, 12:19 PM
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An ammeter is basically wired ahead of the switch so all the current goes through it to the switch and then on to the car. It is this wiring that makes them potentially dangerous and why they run volt meters now. Use a heavy wire since it carries all the current flow (except for the starter draw).
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Old 04-05-2003, 11:10 PM
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[ April 06, 2003: Message edited by: coupe1931 ]</p>
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Old 04-05-2003, 11:11 PM
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thanks woodz,ill give it ago.

[ April 06, 2003: Message edited by: coupe1931 ]</p>
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Old 04-05-2003, 11:14 PM
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[ April 06, 2003: Message edited by: coupe1931 ]</p>
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Old 04-06-2003, 11:56 AM
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i tried pluging the amp meter ( _ ) side into a main feed before it runs into the ignition switch and the ( + ) side into a main feed coming out of the switch but i cant get any reading on the gauge.if i conect it to a main feed coming of the starter and then to the main feed coming of the alt i get a reading that goes of the clock,can anybody tell me where im going wrong? also im still not sure where the two wires run to from the plug on the side of later GM alternators i know that one runs to a charge light and then onto the ignition switch on my A but im unsure if it should come from the top or bottom conection on the alt or where the second wire should run to, can anybody help me on this also?
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Old 04-06-2003, 02:33 PM
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Am ammeter in the hands of someone who really isn't sure of what they're doing can be a dangerous thing. Mainly because you're interupting circuits to install it and installed incorrectly could cause an unwanted short to ground with severe consequences. I know you already said you have the gauge but I would strongly advise you to get a voltmeter. Like woodz said, I don't know anyone still using an ammeter. Here is a link to an older thread about this discussion. I would really hate to see you damage your car with that gauge when a voltmeter is so much easier to use.

<a href="http://www.hotrodders.com/cgibin/ubb/ultimatebb.cgi?ubb=get_topic&f=17&t=000458" target="_blank">Topic: Gauges - Volt or Amp - Is one better than the other </a>


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Old 04-07-2003, 10:51 PM
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I guess your write they dont sound so good,i just had one in a stewart warner set and wanted see if the battery was charging but as an amp dosent show much of that a voltage gauge would be better,so next question how would i wire one of those?
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Old 04-08-2003, 05:56 PM
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Fortunately the voltmeter is an easy one. Generally it's one wire to your power feed to your dash lights (if it's a lighted gauge), another wire to ground, and the third wire (the important one) can either go to any open accessory feed in your fuse box or to a switched feed from your ignition switch. When the car is on the gauge will display your systems charging voltage but as soon as you shut the car off the gauge is off, matching the rest of your gauges.


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Old 04-09-2003, 11:40 AM
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that sounds easier thanks for the advice
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