![]() That means the needle on either one rarely moved more than its own width.Īn earlier AFM thread found with the link below describes the problem, how to test yours and also a simple mod hidden under the radiator if you want to make the ammeter needle move far enough that you can easily see the changes. Make sure you don't exceed the full scale deflection current rating of the meter. To convert the ammeter to volt meter operation simply remove the shunt resistor and add a series resistor. I own two '66 Mustangs and on one the ammeter full scale deflection meant 200 Amps and the other one 110 Amps. This link will show you how ammeters and volt meters work. Core charge includes both lens and amp meter. The longer 200MP adhesive is in place the stronger it binds. Includes New XR7 Amps overlay made from top quality 3M 467MP and use 200MP adhesive. Not usually, its the connections, read zray above.īut also 2) the meters were fairly insensitive even when they were working. These are original amp meters converted from reading amps to reading volts. When this happens nothing else quits working except the ammeter so few know what is wrong and assume its a faulty meter. The problem with the '66 and later Ford ammeters is twofold: 1) because there is so little current in the ammeter wiring the connections can easily get dirty and the meter stops working entirely. I am sure it also cost them a little bit more. Our ’67 Dart’s ammeter needle pointed in the upward direction and swept left-to-right in a 90° range. Many other makes used a similar shunt system but some of them, such as Rolls-Royce, had a system that worked better than the Ford one. Voltmeters are easier and cheaper to install so Ford came up with a cheap, voltmeter style 'ammeter' called a shunt ammeter. A voltmeter mostly tells you that the voltage regulator is working but little else. Buy part 10850-2DK CONVERSION KIT, AMP METER TO VOLT METER for your classic vehicle from National Parts Depot. A radio noise suppression choke wired in series with the constant voltage supply lead reduces the noise.I agree with zray that an ammeter tells you more about the condition of your battery as well as the charging system. ![]() Because vintage Mustangs were born in the age of AM radio, this pulsing causes radio interference. It is a micro-fine, constant pulsing process of contact points that keeps voltage close to five volts. DC 100V 10A LED Voltmeter Ammeter Amp Dual Digital Volt Meter Gauge Accessories, (Fits: Ford Mustang) 4.15. "Bimetallic" means two metals - two dissimilar metals that expand and contract at different rates to open and close contact points inside the voltage regulator. Get the best deals on Volt Meters for Ford Mustang when you shop the largest online selection at. gauge plugs into panel on the 91 & with a lttle work on 67 panel will look factory. ![]() the gauge swings from top just like amp gauge. after install, painted needle to match rest of panel. Voltage regulators fail when contact points burn and pit or the resistor burns out and doesn't get warm anymore. i coverted my 67 f100 amp gauge to a 1991 volt to get ride of amp. Wiring Do not use the existing Ammeter wiring as they are both 12V power leads hooked to the battery. It is this balance of heating element and bimetallic arm with contact points that regulates current flow to your instruments in half-second pulses of electricity. They have a great article on 1966 Mustang gauges. The 2nd drawing is of the actual dash wiring where you can trace those 2 wires, 654 & 655, to the ammeter. In the first drawing the connector marked 'G' in the lower right carries the two wires to the dash ammeter. My ammeter will show a slight charge after the car is started. Although the wiring for a '68 may be a little different Ford was still using a shunt ammeter see attached wiring diagram for a '68. Even when the ammeter on a 66 Mustang is working there is very little movement. Inside, the voltage regulator has a bimetallic arm and heating element (resistor). The ammeter on 66 Mustangs fail and many 66 Mustangs have ammeters that do not work. You can also see where I folded back the original 10 gauge wire and just taped em up. I used a 150 Amp fuse in the circuit to protect it in case a diode in the Alternator shorts out. I installed a cheap-o volt gauge into the stock cluster. I didn't like the idea of not knowing if the Alt was producing voltage. First, you need to see how the gauge mounts: it may mount with attachment tape, or it may be mounted with screws. Tim65GT said: If its a one wire alternator the hookup is very basic: View attachment 487825. I upgraded to a 3G alternator and in the process decided to disconnect my Amp gauge because, well, I like my face not on fire. Step 5: Decide where you want to install the gauge. Step 4: Disconnect the negative battery cable. Temperature, oil pressure, and fuel quantity gauges operate on five-volts of regulated current thanks to a small voltage regulator on the back of the instrument panel, also known as a voltage limiter or voltage reducer. Stand in front of the car and lift up the hood.
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