 Dash / Instrument Lights Problem Unresolved |
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| JimVG |
 Mar 10 2025, 12:59 PM
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#1
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Newbie  Group: Members Posts: 38 Joined: 10-October 24 From: Gig Harbor, WA Member No.: 28,402 Region Association: Pacific Northwest 
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I have researched this problem on this site, and I still cannot correct the issue of no dash/instrument lights on a 1973 914.
The Problem When key is ON, and the headlight switch is in the ON position none of the instrument light bulbs illuminate. Turning the headlight switch dimmer has no effect. All fuses tested functional. Testing Procedure Using a test light that is properly grounded with the headlight switch ON and the dimmer turned to HIGH: There is no power to headlight switch terminal 58a or 58b (Fuse #7 is functional). Using a separate test wire with a working bulb connected to headlight switch terminal 58b and the opposite end plugged into an instrument bulb socket the bulb does not illuminate. Using the same test wire connected to terminal headlight switch 56k (empty and has power) plugged into the same instrument bulb socket the bulb does illuminate (dimmer not functional). Please advise. Your time and consideration is appreciated! |
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| emerygt350 |
Mar 10 2025, 01:27 PM
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Advanced Member Group: Members Posts: 2,667 Joined: 20-July 21 From: Upstate, NY Member No.: 25,740 Region Association: North East States |
I would suspect your switch dimmer is bad. I pulled mine and just bypassed the dimmer. New switches can be purchased I believe. If you pull the switch you can test it by sending 12 past the pot.
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| ClayPerrine |
Mar 10 2025, 01:52 PM
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#3
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Life's been good to me so far..... Group: Admin Posts: 16,183 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille
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QUOTE(emerygt350 @ Mar 10 2025, 02:27 PM)  I would suspect your switch dimmer is bad. I pulled mine and just bypassed the dimmer. New switches can be purchased I believe. If you pull the switch you can test it by sending 12 past the pot. (IMG:style_emoticons/default/agree.gif) The potentiometers are notorious about failing from age. Simple to bypass it and just wire the instrument lights to the park lights. |
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| barefoot |
Mar 10 2025, 03:38 PM
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#4
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Senior Member Group: Members Posts: 1,354 Joined: 19-March 13 From: Charleston SC Member No.: 15,673 Region Association: South East States
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QUOTE(ClayPerrine @ Mar 10 2025, 03:52 PM) QUOTE(emerygt350 @ Mar 10 2025, 02:27 PM) I would suspect your switch dimmer is bad. I pulled mine and just bypassed the dimmer. New switches can be purchased I believe. If you pull the switch you can test it by sending 12 past the pot. (IMG:style_emoticons/default/agree.gif) The potentiometers are notorious about failing from age. Simple to bypass it and just wire the instrument lights to the park lights. For my 76, the instrument lights do come on with parking lights, key off. BTW all are changed to LED's now I can see much better. Barefoot |
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Posts in this topic
JimVG Dash / Instrument Lights Problem Unresolved Mar 10 2025, 12:59 PM
JimVG
[quote name='ClayPerrine' post='3195739' date='Ma... Mar 11 2025, 06:39 AM emerygt350
[quote name='ClayPerrine' post='3195739' date='M... Mar 11 2025, 06:56 AM
JeffBowlsby Circuitry for the switches is here:
https://bowls... Mar 11 2025, 07:44 AM JimVG
Circuitry for the switches is here:
https://bowl... Mar 11 2025, 08:08 AM JeffBowlsby Do you have power at 58b? You should, and if so, ... Mar 11 2025, 12:35 PM JimVG I used a "Power Probe III" to trace the ... Mar 11 2025, 02:32 PM |
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