[TR] Lucas Heater Switch

Mon Nov 27 13:02:15 MST 2017

Moss UK lists 635-180 as Lucas switch 57H5260 which I found a cross referenced to PN78384 on ebay.uk listing.  

Revington: 

class=WordSection2>

That would be equivalent to $90 & $34 plus shipping. 

Also there are Moss distributors that will discount the Moss price such as LBC CarCo for ~$120.  

Looking at the Lucas Pages.  The two don’t look interchangeable (78362 & 78384)

But I guess if Moss etal are selling it as a replacement, it will work.

Carl

From: Triumphs [mailto:triumphs-bounces at autox.team.net] On Behalf Of David Friedlander
Sent: Sunday, November 26, 2017 3:15 PM
To: TeriAnn J. Wakeman <tjwakeman at gmail.com>; TR3 Triumphs <triumphs at autox.team.net>
Subject: Re: [TR] Lucas Heater Switch

TeriAnn ~

"According to my Lucas1961 catalogue 78362D is the optional heater 

switch for the Triumph TR3. takes knob 54332086."

I don't find a 78362D mentioned anywhere on the web.... at least not in 

the way of anything currently for sale....

"

78405 is not a listed number for 1961

"

FWIW, these Lucas heater switches are available on eBay

.

But, as Randall said in his email of a day or two ago:

Stock TR3A is either 78262 or 78362 for (probably) post-60k.  They take

different knobs.  78362 is 2.5 ohms.

78384 is 5 ohms (per Lucas 400e master catalog),

78405 is 15 ohms according to

 <https://www.autoelectricsupplies.co.uk/product/815/category/153> https://www.autoelectricsupplies.co.uk/product/815/category/153

Not really sure what to do for a new heater switch! What do people do if

 their present heater switch fails for some reason? I can't see spending 

$140 for it from Moss 

(

https://mossmotors.com/switch-rheostat-replacement?assoc=41693

). 

Maybe Moss will tell me what the manufacturer's part number is for the 

635-180 they sell....

Dave

On Sat, Nov 25, 2017 at 11:40 PM, TeriAnn J. Wakeman <tjwakeman at gmail.com <mailto:tjwakeman at gmail.com> > wrote:

According to my Lucas1961 catalogue 78362D is the optional heater witch for the Triumph TR3. takes knob 54332086

78384 is for a Morris Minor.  It takes knob 54331278
78405 is not a listed number for 1961.

TeriAnn

On 11/25/17 3:59 PM, Randall wrote:

So, I went to eBay and found heater rheostat switches for the Triumpoh as
either Lucas
P/N 78384 or 78405. Does anyone know: Are these essentially the same item?
Will either
one work on a TR3 heater?

As usual, depends on your definition of "work".

Stock TR3A is either 78262 or 78362 for (probably) post-60k.  They take
different knobs.  78362 is 2.5 ohms.

78384 is 5 ohms (per Lucas 400e master catalog),
78405 is 15 ohms according to
https://www.autoelectricsupplies.co.uk/product/815/category/153

The higher resistance means you'll get less airflow (likely none at all for
the 15 ohm version) for any setting other than 'max'.  But either of them
should give you "high" and "off", which are the only two setting I ever
found to be useful.

Neither appears to accept either of the stock TR3 knobs.

(I didn't check if they will fit in the same hole.)

-- Randall 

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