[T3] Draw on battery.

[William J]

----- Original Message ----- 
From: "William J" <catnine09 at dslextreme.com>
To: <type3 at vwtype3.org>
Sent: Thursday, June 23, 2016 5:53 PM
Subject: Re: [T3] Draw on battery.


> Since it's FI . Once you determine where the draw is and since the battery 
> will be disconnected during the amp draw test you might be able to at 
> least remove one hot lead of the three fuses at the botton on the box . 
> The ones that stay hot are usually 7 8  & 9 with  the key off. they are 
> bridged internally in the fuse box at the lower or bottom of each fuse the 
> top become hot and are fused..
>
> My guess is something is staying on and checking this way will help 
> eliminate  quite a bit . It's not easy yet if you can rule out say the ign 
> switch or power relay , pump relay it will save a lot of time.
>
> I'd say if you find the draw is from the regulator to the dash leave the 
> heavy red /white on and pull one of the others because the red white is 
> the main feed so you want to check just after that to rule out the FI and 
> relays . Som fuse 7 is FI relays find that connector on the bottom of fuse 
> 7 and pull it being careful with n old fuse box . If you have the 
> schematic it will help it may be posted on line on samba think I saw it 
> there. I realize the FI relays are hot all the time and grounded by the 
> ECU yet that does not mean the ground is not pinched keeping the power 
> relay powering the ECU. Perhaps connector T-2 left side of engine 
> compartment front. Just a thought since it was sudden. ----- Original 
> Message ----- 
> From: "dlstiefel" <dlstiefel at dekalbk12.org>
> To: <type3 at vwtype3.org>
> Sent: Thursday, June 23, 2016 4:47 PM
> Subject: Re: [T3] Draw on battery.
>
>
>> On 2016-06-23 17:43, Jim Adney wrote:
>>> On 23 Jun 2016 at 11:07, dlstiefel wrote:
>>>
>>>> When I got home I didn't shut it off and hooked up the DVOM to the
>>>> battery and got about 14.3 volts. Then I shut the engine off the volts
>>>> dropped down to about 13.5.
>>>
>>> That sounds just about perfect.
>>>
>>>> I then took the ground off cable the battery put one lead on the
>>>> ground cable and the other on the negative post on the battery. The 
>>>> DVOM
>>>> red 12.5 volts.
>>>
>>> At this point, as William said, you should be trying to read current.
>>> The current you read should be the same, if you break the ground link
>>> or the hot link, but breaking the ground side is MUCH safer.
>>>
>>>
>>>> I started pulling the fuses one by one look at the
>>>> reading then put the fuse back in. No change on any fuse. I then
>>>> unhooked the wire from the positive side of the battery to the voltage
>>>> regulator and it dropped close to 0. So I thought OK it's the 
>>>> regulator.
>>>
>>> That's not really much of a test.
>>
>> OK give me 30 lashes for that one LOL but in my defense it has helped my 
>> find where the battery draws on a car was for many years. However it dose 
>> seem more thorough to measure amps so you got me there. Like I told 
>> William I will try it wouldn't be the first time I was wrong.
>>
>>> With the DVM still reading current
>>> in the ground link, leave the wire from the + post to the VR in place
>>> and pull off the wire that leads from the VR to the rest of the car.
>>>
>>> If the current in the DVM goes to zero, the leak is somewhere in the
>>> car. (Not everything is fused.)
>>
>> Yes I know that's why I moved on to the regulator after that just 
>> eliminating what I considered the easy stuff first.
>>
>>> If the current still doesn't go to zero, there's a problem in the VR.
>> OK like I told William I will look at the amps next.
>>>
>>>> By the way I just put this regulator on the car back during the big
>>>> restoration. It's one of those newer compact solid state ones that 
>>>> Bosch
>>>> makes now.
>>>
>>> It's always possible that something has gone wrong inside the VR. I
>>> don't know what's in there either. If you're seeing more than 20 mA
>>> of drain current just into the VR, my guess is that that's wrong.
>>> It's possible that they all draw 5-10 mA even when off, but that
>>> would surprise me, and that amount of drain is so little that you'd
>>> never notice it.
>>>
>>> I don't have any personal experience with the new SS VRs. I'll be
>>> producing my own refurbished old style Bosch boxes with solid state
>>> innards by the end of the year. Versions available for either 6 or 12
>>> V. Should mean the last VR you should ever buy.  ;-)
>>
>> Will Look forward to that Jim. But in the mean time if the VR dose turn 
>> up bad I will just have to get another one like I have now.
>>
>> Dennis
>>
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>
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