[T3] '73 Idle Test

William Jahn willjahn975 at gmail.com
Fri Aug 30 12:59:34 PDT 2019

Without doing anything else I drove it today hotter than blazes . Before I
repaired the power relay I had a consistent idle 1000 in park and 850 in
drive . Today is no cooler than yesterday and it still had 1000 @ idle yet
in drive I would see 550 to 750 to 800. why this changed no idea. Unless
the power relay had the affect. I have to say I'm lost . I had TS1
disconnected as usual. I always thought because I've done voltage drops
before if I connected the voltmeter to batt poss and then probed the relay
connected so it has current flow I would read batt voltage at both #30 &
#87 I did this without the engine runner just key on and #30 read 0 mA
telling me the wire was good no drop yet #87 read 2 volts less less than
battery voltage which would the the resistance in the relay contacts. .
Maybe I've just become rusty or have memory loss. I was certain in order to
read voltage drop neg or poss there must be a load and thus current flow .
You are after all looking for resistance in a wire ,switch or circuit .
With an ohm meter you inject the meters battery voltage into the circuit so
it will not work on heavy leads will work on contacts reason I looked for
resistance in the contacts. Just to double check what might be the issue.

On Fri, Aug 30, 2019 at 5:23 AM Jim Adney <jadney at vwtype3.org> wrote:

> On 29 Aug 2019 at 16:23, William Jahn wrote:
> > All I could find was the power relay which #30 and #47 disconnected
> > and an ohm meter across them it had 42 ohms resistance and was
> > consistent.
> Would that be #30 and #87? And I don't know how you measure this
> resistance because those contacts are open unless the engine is running,
> or
> trying to run.
> The way to do this test would be to measure the voltage drop between #30
> and #87 with the engine running. Anything over a few 10s of millivolts
> would
> be a problem.
> At any rate, 47 Ohms is HUGE.
> > Not having another I removed the metal cover and as one would clean
> > trigger points dragging paper through the contacts it's now .02 ohm.
> Which sounds great.
> > Put the cover back on just bending the 6 peens back .
> Just what I would have done. BTW, I have good used relays if you want a
> spare.
> > Also the ground wire when I had the relay upside down kept coming off
> > the female spade was split 1/3 of the way opposite the rolled edges
> > near the end . It never cut out on me so this was not the issue yet I
> > had another factory female with wire in good shape and replaced it.
> > also placed a star washer between the relay hold down and the metal
> > wall.
> Sounds good, except that I would have put the star washer under the screw
> head, followed by the ground lug and then the mounting tab.
> Now you just need to see if this made any difference in how the engine
> runs.
> If I understood your description correctly, this should have made a big
> difference.
> --
> *******************************
> Jim Adney, jadney at vwtype3.org
> Madison, Wisconsin, USA
> *******************************
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