Aqua hot instrument panel switch

[Pete Masterson]

Wow! ... one of those subtle things. I did have my dash switch go bad ... and the symptom was that the AquaHot (and the little green light) simply didn't come on. Before the switch completely failed, I had the green light goes out thing, too. I didn't realize that there was a low-amperage draw that was affected by resistance in the switch. The technician did a complete annual service on the A-H at the time he found and replaced the dash switch, so I assumed that the service had "solved" the quitting behavior -- it never occurred to me that it was (probably) the dash switch going bad....

One of the continuing headaches with the WL (and I suppose nearly every RV) is the very long runs of 12 vdc wires. Resistance and voltage drop becomes a significant factor. When I had my pilot's license, the small aircraft I rented almost always had 24 vdc wiring (unless they were very old) -- While 24 volt circuits cause some headaches with finding bulbs, etc. it's almost too bad that RVs didn't standardize at 24 so that some of these problems would be less... Indeed, most busses use 24 vdc instead of 12 vdc...

Pete Masterson

'95 Blue Bird Wanderlodge WBDA 42 (For Sale)

<http://www.aeonix.biz/BBforsale.html>

El Sobrante CA

"aeonix1@mac.com"

On Jan 27, 2009, at 10:42 AM, p_a_lazar wrote:

Pete,

There was a time prior to Oct last year that I would have said the
same thing.

When my AH got intermittent, like Hish, and then failed to satrt on
diesel at all, I went through the normal (by the manual) and even
abnormal trouble shooting. I consider myself pretty knowledgeable on
the AH. Thanks to Johnny at Bleakley in Unidilla, he fixed it in a
relatively quick fashion. Turns out it *WAS* the dash switch. All
measurements across it were good, it only failed after the purge cycle
when switched on. The purge cycle doesn't draw as much current as the
burner cycle so when the purge timed out and the controller called for
ignition, the switch went high resistive and not enough voltage at
igniter and faulting out.

Replaced the $3.98 switch and all is and has been well.

Paul
97WB43
Leaving sunny *warm* Florida tomorrow for the snow and cold at home

--- In "WanderlodgeForum@yahoogroups.com", Pete Masterson
wrote:

If the AquaHot fails to start, it will turn off the light and the

diesel won't run. Discuss this with your AquaHot technician. If the

switch is bad, the AquaHot won't cycle on at all.

Pete Masterson

'95 Blue Bird Wanderlodge WBDA 42 (For Sale)

<http://www.aeonix.biz/BBforsale.html>

El Sobrante CA

aeonix1@...

On Jan 24, 2009, at 5:12 AM, Hisham Amaral wrote:

My instrument panel switch goes dead (light goes out and the diesel

does not run) after leaving it on for a couple of days. I usually rest

set it and the diesel starts and runs for a couple of day then the

switch goes dead again and must be reset. My question, is the switch

bad or is there something else going on in the system? Any advise is

welcomed.

Hisham Amaral

97 Wanderlodge 43'

Titusville,FL for the winter

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