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Short in Purple Wire "Ignition Off Wire Hot" Circuit  Rating:  Rating
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 Posted: 06-23-2008 12:53 pm
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Lash Russell
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Hello All,

     I was so content that I had solved my ISBWM problems that I thought I'd tackle puting in a CD player in the JH.  Everything was going well, Greg's article titled "Install a Stereo in your JH" was a big help.  I was running a permanent hot lead from an extra "purple" terminal from the cigarette lighter.  Everything was circuit tested, purple hot with ignition off and on (for radio memory when car off) and white with blue tracer hot when ignition on only (for stereo power).

     I must have inadvertantly shorted something because the complete "purple, always hot" circuit went out.  The car still starts, and the guages work etc but there is no power to this circuit such as to the door light, etc.

     Long and short I guess, does anybody know if there is a fuse for this circuit?  I looked at the three fuses in the fuse box and they look fine.  Or perhaps there is an electrical component on this circuit that I may have fried.  Iny insight would be greatly appreciated.

Thanks,

Lash Russell

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 Posted: 06-23-2008 04:03 pm
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Brett Gibson JH5 20497
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Not sure about your car Lash, but I have another 3 fuses in the area of the coil on the fire wall, maybe it's a PO thing but who knows.

Brett

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 Posted: 06-23-2008 11:21 pm
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Lash Russell
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Thanks Brett,

     I don't have anything like that, maybe because your car is a JH-5 or possibly a previous PO addition.  Mine is a '74 Mk II.  I know GT's come with a very large fuse box with several fuses in a row.

Lash

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 Posted: 06-24-2008 04:03 pm
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Bob McDonald
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Hi Lash

The wiring diagram shows the purple wire comes from the fuse box and

goes to the 9 way connector by the steering column and then to the lighter.

If your fuse is o.k. then look at the connector for a bad connection.

Bob

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 Posted: 06-25-2008 01:14 pm
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Lash Russell
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Thanks Bob,

     I think cleaning out the fusebox and all the electrical connections is a good place to start, after all that was the solution to the failed ISBWM.  I'll let you know how it goes.

Lash

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 Posted: 06-25-2008 04:38 pm
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Joel
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On my car the purple wire definately goes thru the fuse box.  The same fuse for the horn and brake lights. 

Why, you may ask, do I know this?  I had someone do some work on the car and when I got it back all those circuits were dead.  I spent HOURS trying to figure out what they did.  I took it back and they spent HOURS trying to figure out what they did.  Eventually we hot wired the brake lights so they would work.

When I was installing my radio.  Whilst (hey it's a British car) in the Lotus position (feet up on the seat and head under the dash) I traced back the purple wire as it's supposed to be a hot.  And, lo and behold, it was trapped under a nut that had been tighted with the wire in the way.  A beautiful dead short - almost impossible to find.

After a quick splice - no problem.  No more blown fuses. 

So, the purple wire goes to the same fuse line as the brakes and horn. 

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 Posted: 06-26-2008 01:50 pm
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Lash Russell
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Thanks Joel,

     The Lotus position, I can relate.  I dread working under the dash, my back hurts for days.  I'll follow the purple wire back as far as I need to, eventually I'll find what I expect to be a short.

Thanks again for the insight.  Lash

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 Posted: 06-26-2008 02:32 pm
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JodyFKerr
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Lash,

i've found it helps the back quite a bit if you can take the seat out and lay some padding down. I use my pad that goes under my sleeping bag. I learned that one when I rewired the car.

Jody

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 Posted: 06-27-2008 12:40 pm
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Lash Russell
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Jody,

     I like the sleeping bag idea, I can lay comfortably untill the chiropractor arrives.  Kidding aside, I think I'll do this as I have to take the seats out to clean them and under the seats anyway.  Thanks for the advice.

Lash

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