Rear window defogger is stumping me.

N8N wrote:
> On Friday, February 14, 2014 12:55:36 PM UTC-5, Mark Olson wrote:
>> On 2014-02-14 10:29 AM, N8N wrote:
>>
>>> No, I meant that if I put a probe on each side of the grid, I
>>> read appx. 12V across them. However you were right anyway; on a
>>> hunch I pulled the trim and pulled the wiring out where it goes
>>> through the bellows seal at the top of the liftgate; ground
>>> completely broken. So apparently that grounds to the hatch
>>> somewhere and I had enough of a ground to show voltage but not
>>> enough to make it work right. Also one of the wires for my CHMSL
>>> is hanging on by a strand and three more wires show signs of
>>> chafing, so I guess I know what I'm doing this evening...
>>
>>
>> Ah.
>>
>>
>>
>> Which is why you need to be very careful when using a high
>> impedance voltmeter.
>>
>> Sometimes it's best to do this sort of thing with a instrument lamp
>> bulb with
>>
>> a couple of pieces of wire soldered on.
>
> yeah, one of these days I am going to buy a nice test light with an
> incandescent bulb... probably ought to have one already, but I
> don't.
>
> The value of all my tools, if I had to replace them with new, is
> likely more than my car, or even a modest house in a less affluent
> neighborhood. And yet there are so many tools that I still don't
> have.
>
> n

Welcome to the club.... I'm not sure it's a good thing to be on a first
name basis with 3 different tool truck operators...

--
Steve W.

On Fri, 14 Feb 2014 12:09:52 -0800 (PST), N8N >
wrote:

>Yup, same bundle. CMHSL is in the liftgate not the body of the vehicle. The harness that I pulled out has the rear defog, tag light, rear wipe/wash, CHMSL, and something else unused (power locks?) all in the same harness, and it goes through a hole in the body with a sharp edge and only electrical tape for protection (yes, the harness is apparently wrapped with adhesive tape.) Thanks, Chrysler! I think I will buy a stick of door edge molding to cover that sharp edge so it doesn't happen again in another 15 years.

Maybe it had a grommet that long ago disintegrated.

Bill Vanek wrote:
> On Fri, 14 Feb 2014 12:09:52 -0800 (PST), N8N >
> wrote:
>
>> Yup, same bundle. CMHSL is in the liftgate not the body of the
>> vehicle. The harness that I pulled out has the rear defog, tag
>> light, rear wipe/wash, CHMSL, and something else unused (power
>> locks?) all in the same harness, and it goes through a hole in the
>> body with a sharp edge and only electrical tape for protection
>> (yes, the harness is apparently wrapped with adhesive tape.)
>> Thanks, Chrysler! I think I will buy a stick of door edge molding
>> to cover that sharp edge so it doesn't happen again in another 15
>> years.
>
> Maybe it had a grommet that long ago disintegrated.


Seems like there was a TSB on that harness. Something to the effect of
new wire/wrap with harness tape and a clip to hold it in place.

--
Steve W.

N8N wrote:
> Got my old Jeep Cherokee just about in "drive anywhere without fear"
> shape... .....

I wouldn't drive any Cherokee anywhere. Those Quadra-Drive ones make me
nauseous just pulling around the shop parking lot.

GW

"Steve W." > wrote in :

> N8N wrote:
>> I'm getting 11.5V at the terminals and also at both
>> sides of the grid.
>.
>
> Bad ground. You have voltage but not enough current to make the grid
> work. Run a jumper to a good ground to verify.
>



I second that.

Bad grounds can create the very weirdest effects. I once had a problem with
my Integra's brake lights that I traced back to a bad ground. My reading of
the EWDs told me that the problem I had was not possible, but it did
happen.


--
Tegger

XJ 'box' Cherokee, not Grand. Other than just general noise, it's rather pleasant to drive, at least given that it's an el strippo 4WD vehicle. Drives pretty well - exceptionally well when you remember it's got a straight front axle and has a rather high COG compared to a regular car.

But my understanding is that the grand is very similar mechanically other than transmission, xfer case and rear suspension...?