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Open Roads Forum  >  Class A Motorhomes  >  Maintenance Issues & Tips

 > no high beam headlights

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Tom/Barb

Oak Harbor, Wa

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Posted: 11/06/20 01:24pm Link  |  Quote  |  Print  |  Notify Moderator

Things we have already done.
1 changed both headlights, confirmed with continuity check.
2 replaced headlight switch. still no high beams.
3 replaced the relay (part number - H8002B).
4 checked every fuse in the coach. (continuity confirmed)
5. checked for power at the relay in both directions. power is good.

????
2000 Newmar mountain aire.
low beams work, as well as parking lights as well as the dash dimmer.

suggestions ?


2000 Newmar mountain aire 4081 DP, ISC/350 Allison 6 speed, Wrangler JL toad.

enblethen

Moses Lake, WA

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Posted: 11/06/20 01:30pm Link  |  Quote  |  Print  |  Notify Moderator

Am guessing you have a multi-function turn signal switch assembly. Have you checked for control voltage to the high beam relay? Does your turn signal lever allow for pulling up for energizing the high beams and down to lock in high beams?


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Charley67

Fulton, MS

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Posted: 11/06/20 01:36pm Link  |  Quote  |  Print  |  Notify Moderator

I just resolved a problem with no low beams. I was about to go into the steering column and look at my multifunctional switch, but I saw that my headlights relay was the same as one right beside it, so I switched them and bingo, lights working bright and dim. $21 at parts store and all is well. Good luck.

Ivylog

Blairsville, GA and WPB, FL.

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Posted: 11/06/20 04:58pm Link  |  Quote  |  Print  |  Notify Moderator

Do you have a smart steering wheel?


This post is my opinion (free advice). It is not intended to influence anyone's judgment nor do I advocate anyone do what I propose.

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Tom/Barb

Oak Harbor, Wa

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Posted: 11/06/20 05:00pm Link  |  Quote  |  Print  |  Notify Moderator

Ivylog wrote:

Do you have a smart steering wheel?


yes.

Tom/Barb

Oak Harbor, Wa

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Posted: 11/06/20 05:19pm Link  |  Quote  |  Print  |  Notify Moderator

enblethen wrote:

Am guessing you have a multi-function turn signal switch assembly. Have you checked for control voltage to the high beam relay? Does your turn signal lever allow for pulling up for energizing the high beams and down to lock in high beams?


The signal light lever can move 3 ways, left/right/ up.
the left/ right turn lights work normally.
the UP is supposed to cause the high beam to come on or off as required. it does nothing. high beams never come on.

I all so notice the the panel lights that operate dim bright function (dimmer) is always on when the key is on.
the light switch also operates the Over head reading light. it operates normal.

also the low beam lights are alway on when the key is on.

Tom/Barb

Oak Harbor, Wa

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Posted: 11/06/20 05:24pm Link  |  Quote  |  Print  |  Notify Moderator

Charley67 wrote:

I just resolved a problem with no low beams. I was about to go into the steering column and look at my multifunctional switch, but I saw that my headlights relay was the same as one right beside it, so I switched them and bingo, lights working bright and dim. $21 at parts store and all is well. Good luck.


there are two headlight relays, 1 was not working. I replaced it. still no high beams.
I switched it, no difference - still no high beams.

enblethen

Moses Lake, WA

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Posted: 11/06/20 06:33pm Link  |  Quote  |  Print  |  Notify Moderator

Did you check for control power at the relay coil? Other side of coil should be ground.
Jumper the contact point in the relay socket to see if high beams come on.

* This post was edited 11/06/20 06:43pm by enblethen *

Tom/Barb

Oak Harbor, Wa

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Posted: 11/06/20 07:02pm Link  |  Quote  |  Print  |  Notify Moderator

enblethen wrote:

Did you check for control power at the relay coil? Other side of coil should be ground.
Jumper the contact point in the relay socket to see if high beams come on.


YES, there is no voltage there. relay is good.

some thing has the circuit to the high beams turned off.

next question? is the low beams suppose to be on with the key on. head switch fully pushed in

I've never noticed.

enblethen

Moses Lake, WA

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Posted: 11/06/20 07:11pm Link  |  Quote  |  Print  |  Notify Moderator

Low beams on some vehicles are daylight running lights.
Don't know if your rig is equipped in that way.

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