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Hi. most people wire volt meters to their alternators, this can be done by simply taking a feed off an ignition live feed, and to an earth. If you wish to wire a ammeter then it needs to be wired in series at the generator output. Make sure you have a decent quality one, as if it fails you will have no charging.
Haynes or Chilton manual should have the wiring diagrams. Your local library might have the right repair manual where you could make copies of the wiring. No such thing as a colored diagram, but any wiring diagram would have all the wires color-coded. Good luck. The wiring on your '68 would be super-simple compared to today's vehicles.
what jam jar are you fixing up ,,well anyway a morris like this with ammeter is no problem ,the feed wire from the battery positive terminal ,the amp meter goes in this cable ,not the big one to the starter motor but the thinner one ,if it doesnt have one then the feed will pick up from the starter solonoid under the bonnet ,right what else do you need to know ,how to build and set up the points ,the carb ,tappet settings ,how to convert to negative earthfor the sound system to work
Seville With 4.6L Engine
On some models, the generator is water-cooled. When this is the case, the repair procedure is as follows:
Disconnect the negative battery cable.
Remove the accessory drive belt.
Drain and recycle the engine coolant.
Remove the radiator.
NOTE: If your vehicle is equipped with air conditioning, refer to the information regarding the implications of servicing your A/C system yourself. Only an MVAC-trained, EPA-certified, automotive technician should service the A/C system or its components.
Remove the A/C condenser.
Raise and safely support the vehicle securely.
Disconnect the coolant inlet and outlet hoses from the generator.
Detach the electrical connections from the generator. The regulator, the battery output, and the heated windshield (if equipped) will need to be unplugged.
Remove the generator fasteners from the generator.
Remove the generator from the vehicle.
Fig. 13: This shows the coolant outlet hose being removed, signified by the "1" in the diagram
Attach the generator to the engine and tighten the fasteners to 37 ft. lbs. (50 Nm).
Attach the electrical connections for the regulator, battery output, and the heated windshield.
Tighten the battery output cable to 15 ft. lbs. (20 Nm).
Reconnect the coolant inlet and outlet hoses to the generator.
Remove the generator harness connector and battery charging wire on the back of the generator. Heated windshield 3-phase connector and clip if equipped.
Release the tension from the drive belt land remove the belt from the generator pulley. Do not remove the belt from any other component pulleys.
Remove the volts, ABS ground strap, and generator from the vehicle.
Fig. 14: Alternator mounting - early models with 4.5L and 4.9L engines
Fig. 15: Alternator mounting - later models with 4.5L and 4.9L engines
Install the generator and ground strap to the mounting bracket with bolts tightened to 20 ft. lbs. (27 Nm).
Raise the drive belt tensioner. Position the drive belt over the generator pulley and release the tensioner.
Attach the generator harness connector and battery-charging wire to the generator output stud. Do not route the battery charging wire to rest against the cruise control servo. Tighten to 15 ft. lbs. (20 Nm). Do not overtighten.
This test determines the condition of the wiring from the generator "B" terminal to the battery (+) terminal (including the fusible link).
1.Be sure to check the following before testing:
Generator installation and wiring connections
Generator drive belt tension
Abnormal noises from the generator while the engine is running.2.Turn the ignition switch to the OFF position.3.Disconnect the negative battery cable.4.Disconnect the generator output wire from the generator "B" terminal. Connect a DC test ammeter with a range of 0-100A in series between the "B" terminal and the disconnected output wire. (Connect the (+) lead of the ammeter to the "B" terminal. Connect the (-) lead of the ammeter to the disconnected output wire.)An inductive-type ammeter which enables measurements to be taken without disconnecting the generator output wire is recommended. Using this equipment will lessen the possibility of a voltage drop caused by a loose "B" terminal connection.5.Connect a digital-type voltmeter between the generator "B" terminal and the battery (+) terminal. (Connect the (+) lead of the voltmeter to the "B" terminal. Connect the (-) lead of the voltmeter to the battery (+) cable.)6.Reconnect the negative battery cable.7.Connect a tachometer or the scan tool.8.Start the engine.9.With the engine running at approx. 2500 rpm, turn the headlights and other lights on and off to adjust the generator load on the ammeter slightly above 30A.Limit: max. 0.3VWhen the generator output is high and the value displayed on the ammeter does not decrease to 30A, set the value to 40A. Read the value displayed on the voltmeter. In this case the limit becomes max. 0.4V.10.If the value displayed on the voltmeter is still above the limit, a fault in the generator output wire may exist. Check the wiring between the generator "B" terminal and the battery (+) terminal (including fusible link). If a terminal is not sufficiently tight or if the harness has become discolored due to overheating, repair, then test again.11.After the test, run the engine at idle.12.Turn off all lights and turn the ignition switch to the OFF position.13.Disconnect the tachometer or the scan tool.14.Disconnect the negative battery cable.15.Disconnect the ammeter and voltmeter.16.Connect the generator output wire to the generator "B" terminal.17.Connect the negative battery cable.