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Slave starting the CUCV If the rear battery is completely shorted: No voltage will be dropped resulting in the front battery and the entire 12v truck circuit seeing 24v. Not a good thing If the rear battery is open: All voltage will be dropped and the front battery and 12v load will see...

See the first example in post #5 above.

And did you wait the required 3 to 5 minutes before attempting to start the truck? TM -10 clearly states: "Wait 3 to 5 minutes after hooking up slave cable to "dead" truck, before attempting to start it. Damage to the truck’s electrical system may result if the truck is started sooner." "If...

From your description of how cranking slowed and stopped on it own, sounds as if the connections to the front battery became open due to heat. It also could have lost it's ground path thru the negative terminal block on the firewall. See this thread on what happens when the front battery is...

The wires burned due to reverse current feedback from the rear battery. If you had quiclky disconneted the rear battery negative instead of the front battery positive things would have been ok (theoredically). See this thread about reverse current...

Disconnecting the front battery ground (only) with any 24v load connected or switched on will cause the 12v system to see 12v at a reverse polarity (feed-back) from the rear battery. This can cause damage to connected 12v devices. The 24v load could be some sort of auxiliary equipment like a...

Greetings MarcusOReallyus, You might consider two Hall-Effect ammeters in place of OR in addition to the volt meters. Like this: http://www.sureelectronics.net/goods.php?id=988 http://www.sure-electronics.net/download/ME-SP230_Ver1.0_EN.pdf These can be used to sense and indicate the output...

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If the rear battery is near or fully charged and the front battery is low or dead, most of the voltage will be dropped at the rear battery resulting in less than 12v to the starting circuit (relay). This is why it is important to follow the TM and wait three to five minuets before starting...

The 12v glow plugs seem to be sensitive to high voltage as evidenced by the cascading burnout effect. It is possible for all of the glow plugs to see more (or less) than 12 volts while slave starting with resistor bypassed. The following might be the reason for the dropping resistor...

Starter run-on is usually the result of a stuck starter relay or stuck starter solenoid. The act of disconnecting the front battery (negative) ground wire, during a starter run-on, can cause the fusible links to fry. This is due to reversed-polarity feedback current flowing from the rear...

Here is a link to the article I wrote: http://www.steelsoldiers.com/cucv/72712-mechanics.html#post902602

If either Gen stops working the other one will continue to charge it's respective battery if it is in need of a charge. Each Gen senses the charge level (voltage) of it's own battery, thru the small red wire, and responds accordingly. At times both batteries are charging simultaneously thru...

Yes you can but must be careful and follow the TM Slave starting the CUCV If the rear battery is completely shorted: No voltage will be dropped resulting in the front battery and the entire 12v truck circuit seeing 24v. Not a good thing If the rear battery is open: All voltage will be...

The diagrams, as published in the Technical Manuals, are missing some wire traces for the Gen 1 charging circuit and two indicator lights (4wd and Oil) in the dash cluster. There has been some discussion about how the Gen-1 charging circuit gets power from the heater blower fuse. This is true...

Pins BEJ are directly connected to light bulbs on both the truck and trailer. These bulbs are grounded on the other end. Since you are using a continuity tester that buzzes when it detects a ground, you are probably reading thru the bulbs indicating a false ground. Use an ohmmeter on a low...

The above post was copied and pasted from another post. The original is much more readable with images etc: http://www.steelsoldiers.com/cucv/56247-alternator-trouble.html#post651739 I am located near you. PM me if you can't get it working correctly, maybe I can help. Gary

Yes, you should be able to slave start with the 12v bypass mod, as long as you follow the TM and wait 3 to 5 minutes after hooking-up the slave. See my explanation in this thread: http://www.steelsoldiers.com/cucv/54720-testing-12v-resistor-2.html#post631993 Hope this helps

Not to be argumentative but, one should be able to slave start just fine if the warnings in the TM are carefully followed. See this post: http://www.steelsoldiers.com/cucv/54720-testing-12v-resistor-2.html#post631993

This link has some simplified pictorial diagrams I made for an article in Military Vehicles Magazine: CUCV The pictorial diagrams show the 24v-charging portion only with wire colors and numbers. The excitation portion can be seen in the first TM wiring diagram on the page. The wire numbers...