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 > 4-way Flashers not working

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drifterpilot

Gloucester, Virginia

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Posted: 03/11/20 08:15pm Link  |  Quote  |  Print  |  Notify Moderator

4-Way Flashers not working
Turn signals work. Brake lights work. Running lights work.
When I step on the brakes, both turn signals on the dash illuminate and stay illuminated as long as I stay on the brakes.
I replaced the turn signal flasher.
What should I check next?
Thanks


2003 Winnebago Adventurer 33V
112,000 miles
Workhorse W20
Vortec 8.1, Allison 1000
Kingdome (in-motion tracking)
Bilstein shocks (installed July 2013)
Safe-T-Plus Steering Stabilizer
Blue Ox Adventa II and KarGuard
Brake Buddy
2019 Chevrolet Colorado LT 4-Wheel Dr


rk911

Wheaton IL

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Posted: 03/11/20 08:52pm Link  |  Quote  |  Print  |  Notify Moderator

how 'bout the 4-way flasher?


Rich
Ham Radio, Sport Pilot
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opnspaces

San Diego Ca

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Posted: 03/11/20 09:12pm Link  |  Quote  |  Print  |  Notify Moderator

Have you replaced any bulbs outside the coach in a while? If so I would pull those bulbs and see if the problem goes away.

If the bulbs are good I would look at the flashers. There are usually two flasher units in a vehicles. You have already replaced the turn signal flasher. You need to find and replace the Hazard light flasher.


2001 Suburban 4x4. 6.0L, 4.10 3/4 ton
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Stim

NE Florida

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Posted: 03/11/20 09:12pm Link  |  Quote  |  Print  |  Notify Moderator

What vehicle?

drifterpilot

Gloucester, Virginia

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Posted: 03/12/20 05:02am Link  |  Quote  |  Print  |  Notify Moderator

Thanks. I will try to locate the 4-way flasher later today.

allbrandauto

maryland

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Posted: 03/12/20 06:29am Link  |  Quote  |  Print  |  Notify Moderator

the fact that your turn signals indicators light in your dash tells you the hazard switch works you have a another flasher somewhere

Matt_Colie

Southeast Michigan

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Posted: 03/12/20 07:40am Link  |  Quote  |  Print  |  Notify Moderator

When you write that "they are not working", do you mean that they do not illuminate or that they do not flash. The fact that the turn signal indicators come on with the brakes indicates that the problem is with the hazard light switch itself as that should never happen. I suggest that you start there.

Matt


Matt & Mary Colie
A sailor, his bride and their black dogs going to see some dry places that have Geocaches in a coach made the year we married.


wildmanbaker

Kennewick, Washington

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Posted: 03/12/20 09:24am Link  |  Quote  |  Print  |  Notify Moderator

It could very well be your turn signal switch that is the problem. Replaced quite a few police car turn switches because they would set with their food on the brake for long periods of time. All the functions go through the switch, brakes, flashers, and turn signals. The contacts would over heat and melt the housings, resulting in either not contact, or contact all the time.


Wildmanbaker


rgatijnet1

Florida

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Posted: 03/12/20 09:46am Link  |  Quote  |  Print  |  Notify Moderator

A known issue with the W20 chassis, that can affect some of your lights, is under the dash. There is a steel brace that supports the dash. This has a sharp/raw edge and there is a major wiring bundle that sits on top of this brace. After many miles of bouncing down the road, this can wear through the insulation on one or more wires and cause several different intermittent problems. Sometimes a fuse will blow, but not always. The contact made between a bare wire and the steel brace will vary if you hit a bump or jostle the dash when parked. The best solution is to put some type of a pad or cover on top of the steel brace so that it does not compromise the bundle of wires. It is easy to spot once you figure out how to stick your head under the dash and look around, which is not the easiest thing for most adults to accomplish. I doubt if this is your problem with the flashers but it is something to keep in mind. I suspect that your issue is with the flasher relay, especially if some of your lights were changed to LED's.

opnspaces

San Diego Ca

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Posted: 03/12/20 10:01am Link  |  Quote  |  Print  |  Notify Moderator

wildmanbaker wrote:

It could very well be your turn signal switch that is the problem. Replaced quite a few police car turn switches because they would set with their food on the brake for long periods of time. All the functions go through the switch, brakes, flashers, and turn signals. The contacts would over heat and melt the housings, resulting in either not contact, or contact all the time.


I would normally agree with you on the switch and that was my first thought as well. But what kind of sets this apart for me that the turn signals and brake lights all work normally. Now after reading the post above about the sharp edge under the dash, I'm inclined to think that's the real cause of the problem.

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