Oil pressure switch location

I had the same problem when I connected my Ipod to my radio when it was connected to it's 12V charger (slightly less technical than a HF radio I know but anyway).

An informed person told me that the problem was occurring because of a ground loop problem. Basically if you connect two 12V audio sources to the same battery, there is a difference of resistance between them and the differential current flows between them, causing the static.

I was told to buy a ground loop isolator from Jaycar (about $20) and install it on the connection between the two sources. In my case the installation was on the audio line between the Ipod and the car radio. This solved the problem perfectly.

Do you have the HF radio set hooked up to the car stereo to use it's speakers etc., or something similar? If so a ground loop isolator should solve the problem.

George i believe connecting the negative wire from the radio direct to the battery is dangerous may cause destruction of the radio in certain situation others will expand on this

I get the same with mine. When I run a fluoro, backlight on the GPS or the waeco the problem gets even worse. I also have the HF straight off the battery posts. I have been told it is the earth of the antenna and that this needs to be improved.
I have HF off the 2nd battery and all the other things off the 1st, and there is no link between the batteries when the car is turned off, so it seems like it is not coming through wiring but something else. I am told you can get noise reducers/RF chokes and similar stuff from electronics stores but havent yet. Let us know if you find the cause or the fix.

Hi George,
I believe that the 4.2 T/D Cruisers are bad for HF interference due to the EMI from the electronic injection.
Can be particularly difficult to fix, I'm told.
Gerry

G/day George, mate the advice about disconnecting the oil pressure switch sounds a bit dodgy to me... not for the electrical interference prob. How ya gunna know your oil pressure??? unless, you are going to fit a manual gauge. I can`t imagine a little old pressure switch being the prob, but then again stranger things have happened, I`m more inclined to go with joc45 on this one though, RF interference is a fact of life, remember the good old days when all one had to worry about was the dizzy & alternator for RF feedback... not so now!!! bloody electronic everything, I`m stickin with me old 80 Effie... least I know what makes her tick. Cheers RG.

My truck also runs the 1HD-FTE motor. I've had the same problem even though my Barrett 950 is installed by the book. I used multiple solutions:
#1 I was advised 2 years ago that any unearthed part of the vehicle needs to be earthed - I went around with a multimeter and put ended up putting earth leads on the exhaust and both fuel tank covers.
#2 I also have big earth leads going from the autotune antenna to the canopy and to the tray and the chassis.
#3 Still had enough noise to stop me using it in the vehicle, and bought a noise reducing speaker from Electric Bug. Cost over $300, but it has multiple settings - I find the first setting works very well - cuts the background noise nicely when driving, and around camp it cuts out lots of extra unwanted noise.
I am happy with this solution even though it cost $$$.

I had the prob years ago with my amateur hf radio. I had the antenna on the frnt of the vehicle where all the noise was and I fixed the prob by moving it to a well earthed position at the rear.

The radio case should be earthed as should the antenna. The outer of the co-ax is the bit that needs earthing of course. The vehicle becomes the ground for the signal. I trust you are using 50 ohm co-ax otherwise big probs.

Oh, dont touch the oil pressure switch; what a crock of advice that!

Like the car radio it is possible to get interference down the power line and you can get a choke and capacitor set up same same to clean the cable of radio frequency from all the electricals.

There could be unusual noise from badly connected and or earthed devices too. Sourcing bad vibes can be pretty technical but the basic stuff i mention usually does it. the noise I was getting came from the alternator but I dont know whether normal or not. Just setting up properly did it for me.

good luck.

Owen

Have a look at the codanoutbackradio group on yahoo. Yahoo login is down at the moment or I'd find you the link.

There's heaps of discussion taken place over the past few years on 100 series and HF interference. Much discussion for possible solutions.

When I was looking at wagons it was enough to put me off buying one.

Dave