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willysmjeeps.com :: View topic - Headlight issue
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Headlight issue

 
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Deadguy
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Joined: Jun 09, 2011
Posts: 776
Location: Bellmore, NY

PostPosted: Tue Feb 24, 2015 3:50 pm    Post subject: Headlight issue Reply with quote

My driver's side headlight blew out. So I bought a new one and installed it. Packard connectors, not Douglas shell, but so was the one I removed. I made sure I lined up the three connectors with the old lines, and plugged it all in. It worked great, for a day. Then it suddenly stopped working. It was freezing out, and I figured I'd do a circuit test in the morning. Then, as I drove home, I noticed the headlight was on again. This morning, I turned the lights on, and it was off. I pulled the headlight, and tested the three wires with the light switch on. One had current, two did not. I think one goes to ground, are the other two supposed to be live?
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1952 M38A1
Marine core reinforced rear bumper, military transistorized turn signal upgrade, arctic heater, 11" drum brakes, 200L PTO winch, Huffy overdrive, deep water fording kit, RT 68 vehicle mounted radio, Trac Locs front and rear.
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Kendall
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Joined: Feb 25, 2006
Posts: 344
Location: Wichita, KS

PostPosted: Tue Feb 24, 2015 4:22 pm    Post subject: Reply with quote

Are you talking about the wires coming from the headlight? Circuit 91 is the ground, 17 and 18 are high beam and low beam respectively. I had a similar problem with blowing of headlights in my jeep. Check the voltage in the wiring harness at the headlight. Mine was registering high so I adjusted the voltage at the regulator.
Kendall
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1952 M38
1952 M38A1
1942 Dodge WC-55
1951 M100 trailer
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Deadguy
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Joined: Jun 09, 2011
Posts: 776
Location: Bellmore, NY

PostPosted: Tue Feb 24, 2015 10:47 pm    Post subject: Reply with quote

Alright. Circuit tested everything. All the correct wires get power, and the highbeams work. Only the low beams don't. I tested it on a voltmeter, and it doesn't get too much voltage. Low beams must just have blown.
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1952 M38A1
Marine core reinforced rear bumper, military transistorized turn signal upgrade, arctic heater, 11" drum brakes, 200L PTO winch, Huffy overdrive, deep water fording kit, RT 68 vehicle mounted radio, Trac Locs front and rear.
www.danhenk.com
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wesk
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Joined: Apr 04, 2005
Posts: 16225
Location: Wisconsin

PostPosted: Wed Feb 25, 2015 1:33 am    Post subject: Reply with quote

As already mentioned excessive high voltage will burn out you lamps. Since you have the voltmeter in hand why not start the engine, accelerate it to about the RPM equivalent of 40 MPH and turn on the headlights. If your reading is above 28 .5 volts then I suggest you adjust the regulator for 28.5.

If the reading is 25 to 28.5 volts then she is fine and the issue is in bulb quality. Have you taken ohm readings of the bulb's filaments to see if they are actually blown?
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Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100

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Deadguy
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Joined: Jun 09, 2011
Posts: 776
Location: Bellmore, NY

PostPosted: Wed Feb 25, 2015 2:51 am    Post subject: Reply with quote

How do I take the ohm readings Wes?
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1952 M38A1
Marine core reinforced rear bumper, military transistorized turn signal upgrade, arctic heater, 11" drum brakes, 200L PTO winch, Huffy overdrive, deep water fording kit, RT 68 vehicle mounted radio, Trac Locs front and rear.
www.danhenk.com
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wesk
Site Administrator
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Joined: Apr 04, 2005
Posts: 16225
Location: Wisconsin

PostPosted: Wed Feb 25, 2015 9:57 am    Post subject: Reply with quote

That's a lot of typing to explain and depends on the meter you are using and it's ranges. It's time to get a helper who knows electricity and meters.
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Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100

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4x4M38
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Joined: May 30, 2014
Posts: 3440
Location: Texas Hill Country

PostPosted: Wed Feb 25, 2015 7:00 pm    Post subject: Reply with quote

This may be a stupid question but where did you check voltage
on the wiring? If at the headlights I respectfully walk away.

The reason I ask is if the voltage was not checked at the headlights
there could be a little confusion and the dimmer switch may be bad,
providing voltage to the high beams only. That also may explain
the intermittent operation.

Those old switches are mechanical, and after having one apart
can easily see the thing failing partially or completely.
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Brian
1950 M38
MC11481
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Deadguy
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Joined: Jun 09, 2011
Posts: 776
Location: Bellmore, NY

PostPosted: Wed Feb 25, 2015 11:28 pm    Post subject: Reply with quote

I checked voltage right where the packard connectors mate next to the back of the headlight bucket. I also checked them inside the headlight bucket where they mate to the cables extruding out of the bulb itself. I revved the engine and it didn't go above 26.5 volts.
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1952 M38A1
Marine core reinforced rear bumper, military transistorized turn signal upgrade, arctic heater, 11" drum brakes, 200L PTO winch, Huffy overdrive, deep water fording kit, RT 68 vehicle mounted radio, Trac Locs front and rear.
www.danhenk.com
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Xamon
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Joined: Sep 18, 2012
Posts: 588
Location: South East Saskatchewan

PostPosted: Thu Feb 26, 2015 9:11 am    Post subject: Reply with quote

What was the bottom end voltage at idle? too little voltage can cause some issues as well.
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Carievale Saskatchewan Canada
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Deadguy
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Joined: Jun 09, 2011
Posts: 776
Location: Bellmore, NY

PostPosted: Fri Feb 27, 2015 2:45 am    Post subject: Reply with quote

25.5
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1952 M38A1
Marine core reinforced rear bumper, military transistorized turn signal upgrade, arctic heater, 11" drum brakes, 200L PTO winch, Huffy overdrive, deep water fording kit, RT 68 vehicle mounted radio, Trac Locs front and rear.
www.danhenk.com
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Deadguy
Member


Joined: Jun 09, 2011
Posts: 776
Location: Bellmore, NY

PostPosted: Tue Mar 10, 2015 12:31 am    Post subject: Reply with quote

So, Wes turned out to be the closest. A metal terminal inside a packard connector had backed up in the sleeve and wasn't fully connecting with the male end most of the time. Everything turned out to be in working order, and now I have an extra headlight just in case.
_________________
1952 M38A1
Marine core reinforced rear bumper, military transistorized turn signal upgrade, arctic heater, 11" drum brakes, 200L PTO winch, Huffy overdrive, deep water fording kit, RT 68 vehicle mounted radio, Trac Locs front and rear.
www.danhenk.com
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