Map Light Wiring

Topic: Map Light Wiring (Read 761 times) previous topic - next topic

Map Light Wiring

July 11, 2018, 02:27:50 am

I have replaced my puck lights with LED lights. All of them I have replaced are now working, except the map light.

The original wiring had two white wires. The +12v one is # 99B, which is listed in the wiring list as map light. The "ground" wire is also a white wire, #17, which is not listed in my wiring list.

Does anyone know what white wire #17 is used for?

If someone with a 1999 or 2001 FT would please check their wiring list and see if theirs has a wire #17 listed, I would appreciate the information..

I tried running a wire from the green wire running to the other puck lights and that did not turn it on (with the map light switch on). It did turn on when I put +12v to the '+' terminal on the light and the the negative terminals from a small 12v battery to the '-' terminal on the light.

Any advice or suggestions?

Thank you,

Trent

Re: Map Light Wiring

Reply #1 – July 11, 2018, 11:02:11 am

My 2002 Wire List shows #17 is "Grd to Map Light." #99B is "Map Light."

Is this the Map Light over the driver's shoulder or the one for the co-pilot? Could be a bad switch. Try by-passing it. Also, check voltage on #99B and Grd on #17.

Hope this helps,

Rich

Re: Map Light Wiring

Reply #2 – July 11, 2018, 02:54:15 pm

My map light works off of the headlight switch that dims the dash lights.

Re: Map Light Wiring

Reply #3 – July 11, 2018, 06:52:15 pm

Trent, here is what I can find from my 2001, U320 book.

Wire 98B is +12V to the map light. Wire #17 is listed as a White, ground to map light. Wire #17 goes to the map light switch on the side panel and the switch closes a ground path through Wire #237 Green, which is a console switch ground, probably used for more than one switch. Wire #73 White is a dimmed power supply from the headlights switch to the switch indicator lamp.

Power for Wire #98 White comes from a 15 amp Circuit Breaker labeled #40. These are behind the panel in front of the passengers seat on my coach.

The photo is from drawing B-2179 for my coach. Yours might be slightly different.

Re: Map Light Wiring

Reply #4 – July 12, 2018, 02:06:44 am

Thanks, Roger; that is exactly what I needed. Will check that location on my B-2179 tomorrow. Do not know why it was not listed in my list of wires. Maybe it changed between the printing of my 2000 manual and your 2001 manual.

As an electrical engineer, I just can't wrap my head around someone deciding to use the same color wire for the positive AND ground wires for an electrical device.

[Off-topic Warning:]
That's still not as bad as the engineer who put the TACAN antenna for the F-4 Phantom on the nose wheel door. Many pilots lost TACAN lock while in the landing pattern. Took a long time to figure out why. The bottom line is that the polarization of the signal changed when they put the wheels down for landing. But I digress . . .

[End of off-topic comment!]

Trent

Re: Map Light Wiring

Reply #5 – July 12, 2018, 02:09:56 am

Quote from: Rich Bowman – July 11, 2018, 11:02:11 am

Is this the Map Light over the driver's shoulder or the one for the co-pilot?

Rich,

It is the forward-most puck light on the driver's side, which is controlled by the map light switch.

Trent

Re: Map Light Wiring

Reply #6 – July 12, 2018, 08:59:59 am

Trent, I wondered about that too and came to the conclusion that the circuit is essentially +12v hot with a lamp in the middle to the switch is where the connection to ground is made and past the switch it is green. Generally green ground wires are connected directly to ground. Most circuits have a switch in the + 12v supply side and the device being powere is connected directly to ground.

If you ever look at the water pump switches (on mine anyway) or the fill valve switches they have two green wires to the switch and a white wire to the indicator bulb. The momentary switches complete a ground path to the latching relays which causes the latch to cycle from on to off or off to on. The relay if it is on supplies power to the pump or the fill valve solenoid. That one took me a bit of thinking to figure out.

Re: Map Light Wiring

Reply #7 – July 13, 2018, 09:27:23 am

"My map light works off of the headlight switch that dims the dash lights.

"

Is that why my two front map lights dont work? Ihave to use the headlight switch? So far I have reached back and turned on the next reading light, as neither on the overhead lights come on. I always foreget to check the circuit on pre flights. .

Re: Map Light Wiring

Reply #8 – July 13, 2018, 09:45:01 am

Turn your headlight switch all the way counter-clockwise (lefty: loosey, righty: tighty if you only have a digital phone

)
You will feel the built-in detent. Then toggle the appropriate light on up near the light.

Re: Map Light Wiring

Reply #9 – July 13, 2018, 10:12:51 am

The map light over the driver seat in the underside of the cabinet is controlled by a console switch in Trent's 2000 U295, the original poster whose question was about his 2000. The coaches from the 1980's are not the same as his.

When you don't look at the thread enough to discover the real and original question and just start veering off topic, the answers while perhaps correct to your coach have limited use to the original post.

Believe it or not, not all coaches are the same.

Re: Map Light Wiring

Reply #10 – July 13, 2018, 03:26:33 pm

Uh, Mike's coach is a 1988, much closer to our '89 than a 2000 coach.

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Map Light Wiring

July 11, 2018, 02:27:50 am

Re: Map Light Wiring

Reply #1 – July 11, 2018, 11:02:11 am

Re: Map Light Wiring

Reply #2 – July 11, 2018, 02:54:15 pm

Re: Map Light Wiring

Reply #3 – July 11, 2018, 06:52:15 pm

Re: Map Light Wiring

Reply #4 – July 12, 2018, 02:06:44 am

Re: Map Light Wiring

Reply #5 – July 12, 2018, 02:09:56 am

Re: Map Light Wiring

Reply #6 – July 12, 2018, 08:59:59 am

Re: Map Light Wiring

Reply #7 – July 13, 2018, 09:27:23 am

Re: Map Light Wiring

Reply #8 – July 13, 2018, 09:45:01 am

Re: Map Light Wiring

Reply #9 – July 13, 2018, 10:12:51 am

Re: Map Light Wiring

Reply #10 – July 13, 2018, 03:26:33 pm

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