Flasher/ signal light Question

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May 6, 2018 | 09:46 AM

benbuilder

Thread Starter

Fleet Mechanic

Joined: Sep 2012

Posts: 1,610

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Flasher/ signal light Question

I am trying to get my 66 f100 truck mechanically sound before i completely assemble it.

I Yesterday i received my new flasher emergency switch and i installed it.

I tried to turn on the signal lights and only one side on the dash lights up. If i turn on the flashers, both lights on the dash light up. So a least i know the signal bulbs are not burned out and are functioning.

I do not have any tail/signal lights hooked up,

Front signal lights are just dangling off the firewall. they do not light up.

At the flasher relay, i do have power coming in. No idea if my flasher relay is any good. However, i did try a few others.

I think someone will tell me the answer is to put the truck together they try again after all grounds are installed.

Thanks

Last edited by benbuilder; May 6, 2018 at 09:56 AM. Reason: added words

May 6, 2018 | 10:17 AM

TA455HO

Lead Gopher

Joined: Aug 2012

Posts: 10,082

Likes: 1,638

From: Seattle

Well, it is true that the housing for the front and rear lights is also the ground plane so the housings MUST be grounded in order to have a complete circuit. At a minimum a jumper wire from the housing to ground. They just ain't gonna work without that.

Chad

May 6, 2018 | 02:05 PM

FuzzFace2

FTE Legend

Joined: Nov 2015

Posts: 30,995

Likes: 4,143

From: Angier, NC

And may need both bulbs, front & back wired into the system as the flashers work on load and with 1 bulb may not be enough load to work the flasher.
Dave ----