Kohler Perkins

[Chuck Wheeler]

Tim,

This is a good test of the sending unit and if the wiring is intact, but did not show my problem which was corrosion in the dash connector on the common return for the gauges. My first indication was when I disconnected the temperature gauge and the oil started reading closer to normal. That is when I used resistors in place of the sending units to provide a known reading. I first place the resistors at the gauges to observe their accuracy then at the sending unit locations which tells me what, if anything, is being lost in the wiring. The only reason I bring the up is I replaced a good gauge because a multimeter does not provide the low resistance load of the gauge and wiring or ground problems can be missed.

- Chuck Wheeler-

1982 FC 31SB Fort Worth TX

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From: WanderlodgeForum@yahoogroups.com [mailto:WanderlodgeForum@yahoogroups.com] On Behalf Of timvasqz
Sent: Friday, December 19, 2008 9:03 PM
To: WanderlodgeForum@yahoogroups.com
Subject: [WanderlodgeForum] Re: Kohler Perkins

If you disconnect the sender wire and hook up a multimeter ohms 300
+to sender -to ground, the meter should show less ohms as the engine
warms. If you know what the ohms value for 75degree and again for
150DegF you could compare it to your test and prove the sender. The
temp gauge is nothing more than an ohm meter.

I find it best to price the OEM sender and the gauge first. often
you can find a more modern new pair(sender, gauge) for less than the
cost to replace one or the other of the classic,OEM hard to find
parts.

the ohm value for the sender at a given degree has to match the gauge,
they are a pair. one thing to look at is the scale . you dont need a
gauge over 250 degrees and under 130 ( the wanderlodge 94,8v92
watertemp gauge is the worst example of a useful scale)..

Some time the wire between the sender and gauge is screwed. if it is
close, jump a wire and look to see if a hot engine moves the gauge
any?

dont use tefflon on a new sender.

an idiot light is prompted by a switch not a sender, they look alike

GregoryO'Connor ofTim&Greg
94ptCa

--- In "WanderlodgeForum%40yahoogroups.com", "Paul Downey"
...> wrote:
>
> The water temp and oil pressure guages on my 83 PT35 are not reading
> correctly and i need to replace the sending units on both. I do not
> know if these were supplied by perkins,kohler,telflex or BB. I have
> tried calling BB tech service but get no return call. Has anyone
> replaced the sending units and if so have any numbers or where to
> purchase.
>
> Paul Downey
> Versailles Ky
> 83PT35
> Our Rollin Home
>