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 ?

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?

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.

Do you have a smart steering wheel?

Ivylog wrote:Do you have a smart steering wheel?yes.

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.

no high beam headlights | Good Sam Community

Tom_Barb
Explorer
Nov 07, 2020
Up date..

as soon as the key is turned on, the low beams come on. headlight switch fully retracted.
headlight switch out 1 click, low beams still on.
headlight switch full out (2) clicks, all lights go out.

is there a chance a relay is out of position.

nc19143@comcast.net - for pictures of the fuse boxes and relay position.
Tom_Barb
Explorer
Nov 07, 2020
enblethen wrote:
In theory the low beam relay would be energized by the ignition switch. Low beams would go out when high beams come on.
A set of contacts in the low beam relay could be bad if my theory of operation is correct.
If low beam relay is the same as high beam or if you have old relay, change out low beam relay.

we will do that in the morning.
enblethen
Nomad
Nov 07, 2020
First click should be parking lights, second should be headlights.
Post relay and headlight part numbers.
AllegroD
Nomad
Nov 07, 2020
Had a similar problem a few years back. Brights but no dims. Turned out to be the wire harness in the column.
Tom_Barb
Explorer
Nov 07, 2020
enblethen wrote:
First click should be parking lights, second should be headlights.
Post relay and headlight part numbers.

Right .....

did it again same results, all relays checked aging. all fuses checked again....
relay part number is 12088570
enblethen
Nomad
Nov 07, 2020
Sure sounds like it is the multi-function switch in the steering column or the wiring between it and the relay.
Is your relay and wiring in the compartment on outside below the driver?
Tom_Barb
Explorer
Nov 07, 2020
enblethen wrote:
Sure sounds like it is the multi-function switch in the steering column or the wiring between it and the relay.
Is your relay and wiring in the compartment on outside below the driver?

It's in the front cap.

what is powering up the low beam head lights when the switch is off?
enblethen
Nomad
Nov 07, 2020
My guess it is from an ignition circuit.
You never noticed before that the headlights were on all the time? Did you have critters get in the rig and eat wiring?
Are the relays plug-in style? Pull the low beam relay and see if they still lit.
Have you tried to look for wiring diagram on Newmar's website?
Newmar
Tom_Barb
Explorer
Nov 07, 2020
enblethen wrote:
My guess it is from an ignition circuit.
You never noticed before that the headlights were on all the time? Did you have critters get in the rig and eat wiring?
Are the relays plug-in style? Pull the low beam relay and see if they still lit.
Have you tried to look for wiring diagram on Newmar's website?
Newmar

I'll get Newmar involved Monday.. they don't work Fridays.
enblethen
Nomad
Nov 07, 2020
You might try set up the account login. It could be interactive to some point.
Memory says Newmar uses their own chassis, is that correct?
Do you have the Owner's manual. Is there anything in it about chassis operation?

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no high beam headlights

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