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Straight from the troubleshooting section of the TM 9-2320-289-20 tech manual: 33. HEADLIGHTS INOPERATIVE IN HIGH AND LOW BEAM (ALL OTHER LIGHTS OPERATE) NOTE It may be necessary to remove headlights to perform this step. Step 1. Check for voltage at headlight connectors. If there is voltage...

https://www.youtube.com/watch?v=9CdVTCDdEwI

The stock headlight wiring supplies power to the headlight upgrade harness. It supplies 12v to the new relays that feed the headlights. You switch on the stock headlight controls and instead of supplying a bunch of power to the bulbs, it supplies a little power to the relays. Before you think...

It has been stated before that we will not put up with people talking about how to get around the "off road use only" portion of the HMMWVS sales. thread closed.

Good save. [thumbzup]

You mean something like this? If your truck is a 1987 USAF truck it is very likely the tank looks like the above picture. Make sure you post your info in this thread: http://www.steelsoldiers.com/showthread.php?79736-Late-Model-USAF-M35A2C-Registry

Welcome to the site. The horn on issue can have an effect on the headlights. Do some troubleshooting and report back. Could be as easy as bad headlight bulbs.

Fellow member AntennaClimber is making new cards. www.glowplugcards.com make sure you download the free technical manuals. There is a troubleshooting section for non-operating glow plugs. Also read all the listed threads in the CUCV Helpful Threads sticky. There are more issues with your GP...

And expensive to feed. ;-)

The voltmeter resistor is 300 ohm. Many threads that discuss it.

Moved. Have you checked the fuel line that is running under the radiator? Many times it has been crushed and restricts the fuel flow.

Fuse #12 and #15 in the fusebox. you can find the fusebox diagram in the TMs, the CUCV FAQ thread or the CUCV Fusebox Layout thread that is listed in the CUCV Helpful Threads sticky. Also the TM 9-2320-289-20 tech manual has a step by step troubleshooting section for a non-working voltmeter.

There are two fuses and a relay that control the voltmeter. First fuse is the 24v fuses that feeds the voltmeter and is controlled by the relay. Second is the 12v ignition fuse. When the key is on it feeds 12v for the relay to energize and send the 24v to the meter. The voltmeter relay is...

Have you read and watched the video on Glow Operation? http://www.steelsoldiers.com/showthread.php?62477-GP-Module-Theory-of-Operation There is a lot of good reading in the CUCV Helpful Thread sticky.

Looks like you figured it out. Good job.

It also depends on which truck you are working on. Helps if you provide us that info.

Are you bleeding the system in the correct order? airpack first?

Just a reminder folks that insurance discussion is not allowed. The stickies cover that topic.