[T3] Fuel Pump Relay - 69 Fastback

[Tim Schiller]

Without putting a bigger charger on battery, it is at 13V now. There is also 13V at the power relay.

Thought I would start at beginning at check pump relay again. There is 13V at the 30 pin. When ignition is turned on, there is also 13V at the 85 and 86 pins.

When I check the 87 pins it is pretty consistent at zero. This is true with multiple new relays. If I disconnect pump wire, should I get 13V at the pin? I was just trying to eliminate the pump causing a short.

The negative braided battery cable has some corrosion. I will need to order one if I’m to replace.

Harbor Freight has an ignition bypass to allow starting of car when you can’t fully turn key. Is this the type of bypass you are referring to?

I was reading out of a Clymer manual and it discussed pulling the wire from the 85 pin on the pump relay that I believe goes to the ECU #19. It says to ground this wire to Bypass ignition. Says the pump should run full time when doing this to test if pump is good. Didn’t want to do until asking someone much smarter than I.

I still need to check the ground from the frame to the transmission. I also need to follow the wire from the starter as suggested. How do you follow a wire when it disappears inside the harness and is covered with the rest of the wires?

It seems like the biggest problem is the is no power at the 87 pin on pump relay.

Sent from my iPhone

> On Jul 11, 2021, at 2:03 PM, William Jahn <willjahn975 at gmail.com> wrote:
> 
> When I checked mine a while back I unplugged the ign coil . Since this
> issue seems to work sometimes and it runs wouldn't it make sense that the
> ign switch might be the problem. It seems intermittent to me and they don't
> last forever and it's a moving part.  We know it's not the relays he
> replaced both with the same result. Seems  since the ign switch could be
> the cause. I don't know if 69 has a replacement part.
> https://www.westcoastmetric.com/c-1182978-vw-type-3-1969-vw-type-3-electrical-ignition-switches-harness.html
> 
> It's just a thought and after what he has already checked and really found
> nothing it might be a good place to check . Never tried to bypass the ign
> it's possible to do as long as one can use a jumper to pull from the
> starter circuit once it starts . Or for the sake of just a test just jump
> the battery hot to the run just to see if the pump and relays have battery
> voltage could even unplug the coil during the test so it will not overheat.
> 
>> On Sun, Jul 11, 2021 at 1:34 PM Jim Adney <jadney at vwtype3.org> wrote:
>> 
>>> On 11 Jul 2021 at 11:21, William Jahn wrote:
>>> 
>>> When checking for a voltage drop in one wire to the power relay one the
>> pump
>>> relay times out the only draw on the power relay is the ECU .
>> 
>> Also, the ignition
>> --
>> *******************************
>> Jim Adney, jadney at vwtype3.org
>> Madison, Wisconsin, USA
>> *******************************
>> 
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