Headlight issue?
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=110356
Printed Date: 14 Sep 2025 at 2:39am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: Headlight issue?
Posted By: skeeters65
Subject: Headlight issue?
Date Posted: 13 Aug 2015 at 9:25am
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Hey guys I just picked up a B. That is still set up with a 6 volt system. One of the headlights will come on and off if you tap the housing. And sometimes it comes on very dimly. What should I look at? I don't understand this 6 volt system. Thanks |
Replies:
Posted By: grinder220
Date Posted: 13 Aug 2015 at 9:27am
| Sounds like a ground issue |
Posted By: DougS
Date Posted: 13 Aug 2015 at 10:15am
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^^^ This. The lamp is probably grounded through the mounting bracket. This is a common place where ground connections go whacky. |
Posted By: Dick L
Date Posted: 13 Aug 2015 at 10:47am
Normally that can be cleared up by removing the light and cleaning the rust off. There is a short wire inside that grounds the bulb that could not be making good contact with the housing. Take it apart and see what is going on. Learning time! Even us old duffers can't learn any younger. 
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Posted By: skeeters65
Date Posted: 13 Aug 2015 at 6:03pm
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Ok. Time to dig in. 12v doesn't bother me. But this 6v stuff has me baffled. |
Posted By: truckerfarmer
Date Posted: 13 Aug 2015 at 10:03pm
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Only difference between 12 and 6 volt, is the voltage. Everything still works the same. Must have power and ground for things to work. 1.5, 6, 8, 12, 24 volt don't matter. ------------- Looking at the past to see the future. '53 WD, '53 WD45, WD snap coupler field cultivator, #53 plow,'53 HD5B dozer Duct tape.... Can't fix stupidity. But will muffle the sound of it! |
Posted By: dustinmo
Date Posted: 13 Aug 2015 at 10:11pm
| could be filament in the bulb is bad and when you tap on it it bounces around and touches each other where it welds itself together and works, I would start cleaning and replace bulbs, or you could take out bulb and ohm through it |
Posted By: Ted in NE-OH
Date Posted: 13 Aug 2015 at 10:49pm
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The reflector is supposed to ground to the case of the light, so the problem could be internal. ------------- CA, WD, C, 3 Bs, 2 Gs, WC, I-400, 914 |
Posted By: slip knot
Date Posted: 13 Aug 2015 at 11:30pm
| On the old machines it usually the ground that goes bad. They use a case ground and every piece between the light and the battery ground has to be clean to complete the circuit. The best thing I've found is to run seperate grounds to each light. a easy check is to run a jumper wire from you battery ground to the light case. if it burns clean then you can assume the circuit is not complete. |
Posted By: Steve in NJ
Date Posted: 14 Aug 2015 at 6:36am
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Connection problem whether ground or power. Sometimes the sockets get corrosion in them not allowing the bulb to make good contact. Other times it could be as simple as the grounds like the guys mentioned. Either way, easy fix! Don't let the 6V throw ya. Same as 12V cept' a little less voltage, and a little more amperage. Same principal applies. If you pigtail connections are all corroded from age, we offer a nice wiring repair kit for the B,IB,C,CA model Tractors headlights. Steve@B&B ------------- 39'RC, 43'WC, 48'B, 49'G, 50'WF, 65 Big 10, 67'B-110, 75'716H, 2-620's, & a Motorhead wife |