Re: {Chrysler 300} 1962 300 - Mystery Electrical

[John Grady <jkg@xxxxxxxxxxxxxxxxx>]

Hi ,

the only two ways arrow can come on with park  is a short between park light wire and  directional light wire ( most likely — although remote, — at socket wiring or harness plugs on front radiator support      ) or no ground at socket ( feeds from one filament through to other ) . Check shell of socket with low ohm meter . Was it disturbed? Is housing grounded ? Good connection by spring fingers 

Have also seen wrong bulb (or mangled socket to do it ) where a single contact bulb bottom with one pin  filed off ,  touches both contacts . Cant make this stuff  up

check bulb # . Surprised bulbs all dead . Test at battery press brass against battery (-)put  jump wire + to each contact       

 

hum is the dash power supply , EL dash lights come on with park      

Directional hold  or not is the little switch on steering  column under dash that always fails.  It is supposed to release  directional  as you turn wheel . Bad mechanical design .  Internal copper fingers ( R and L ) break off from fatigue  . Some aftermarket market replacements are very good, but not sold since? 70’s   Look totally different.  

That is why at Forward look parts we made a timer based replacement for that . 

On Jul 13, 2025, at 7:34 AM, 'Jay Williamson' via Chrysler 300 Club International <chrysler-300-club-international@xxxxxxxxxxxxxxxx> wrote:

Hello,

The hum is most likely the transformer that powers you Ellectrolumination. I’m having similar issues with my lights. I have a newly rebuilt headlight switch. When I pull,it out one click, the left turn signal arrow illuminates. My turn signals have never worked correctly. The right signal flashes, but you have to hold the lever over. The left signal does not flash, but will stay in place.  I figure it’s a grounding issue, but I’ve not had time to chase it down

Will be watching comments here

Jay Williamson

Sent from my iPad

On Jul 12, 2025, at 8:46 PM, 'Matt Allyn' via Chrysler 300 Club International <chrysler-300-club-international@xxxxxxxxxxxxxxxx> wrote:

Was working on our 300 Sport today.

Seem to have some mystery electrical things going on….

Mystery Issue #1:

I wanted to check the front running lights.

Pulled out the Headlight Switch 1-click to activate them.

There is a high pitched hum (or whine) coming from the headlight switch.

And the passenger inner indicator, little green arrow was illuminated.

Neither bulb, up front, came on, so I pulled the lenses & discovered dead bulbs.

I replaced both bulbs in front of the car & rechecked it all.

Passenger one works fine now & the dash arrow was not illuminated on the passenger side anymore.

Drivers one is super dim (at the bulb) and the dash arrow on the drivers side is now lit up.

I had used electrical cleaner spray inside both bulb sockets & also used it on the connector for the front indicator that lives in between the radiator & the grill.

Anyone know what causes the bulb to barely illuminate in running lights mode, yet its other filament flashes bright in indicator mode?

Mystery Issue #2:

The electrical hum at the headlight switch.

What the heck does that mean?

Thanks!

Matt Allyn

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