The Dreaded Under-The-Tank 4 Pin Connector (85 K100rs)

[robdiaz44]

I have heard that you can replace the 4 pin connector with a trailer connector. Not sure if this can be done on the old (pre 05/85) under the fuel tank connector. I've been scouring the forum to find out, but can't seem find anything. Looking for some input here...thanks in advance.

Here are pictures of: 1) the old female connector that I have since replaced with the "spare" connector that was in the relay box...the 2 "fried" connectors are the pos and neg to the fuel pump; and 2) the male part of the connector...my concern is that the 2 darker connectors (pos and neg connections to the fuel pump) are not becoming glitchy and compromising the necessary electrical connection/power to the fuel pump.

Again...wondering if I can replace the whole thing with a trailer connector.?.?

[Laitch]

my concern is that the 2 darker connectors (pos and neg connections to the fuel pump) are not becoming glitchy and compromising the necessary electrical connection/power to the fuel pump.

You're concerned that they're not becoming glitchy? Pour some salt on them and they'll be glitchy soon enough. :hehehe

Anyway, read this post and the two after it to allay your fears and get you going.

[robdiaz44]

Thanks Laitch...ya, I kinda worded that part of my post as if I was hoping for some glitchiness, in which case, I should take your advice and pour some salt on those connectors  :falldown:

From reading that post, sounds like I will need to pursue getting a new fuel sender (since my '85 K100 can't be modded with the trailer connector). I've already replaced the female part of the connector, but I don't think I trust the male connectors of the sender. From the looks of the burnt plastic on the female end, there maybe unseen damage hidden behind the plastic of the male end.

[Freccia]

old thread- does anyone have a part number for this plug? thx in advance

[rbm]

This connector was recently proposed on another forum as meeting the need.

https://www.ebay.ca/itm/4-Pin-Grade-IP68-Waterproof-Electrical-Connector-Cable-Plug-Socket-Black-M14/262771837834?hash=item3d2e6c0b8a:g:chEAAOSwNnRYlXIm

NOTE:  It's not yet been confirmed that this plug actually works with the 83-85 fuel level sender / fuel pump connector.

[johnny]

greetings...

i have used 4 pin flat trailor wiring harness connectors with 100% positive results...


4pinFlatConnector.jpg (4.27 kB . 200x104 - viewed 1268 times)

j o

[rbm]

Johnny, that'll certainly work for the post-85 fuel sender but this thread is about the early 83-85 sender.  The plug has to be compatible with the receptacle.  There's no alternative.

[Freccia]

This connector was recently proposed on another forum as meeting the need.

https://www.ebay.ca/itm/4-Pin-Grade-IP68-Waterproof-Electrical-Connector-Cable-Plug-Socket-Black-M14/262771837834?hash=item3d2e6c0b8a:g:chEAAOSwNnRYlXIm

NOTE:  It's not yet been confirmed that this plug actually works with the 83-85 fuel level sender / fuel pump connector.

Thanks rbm. Looks like it's worth a try/whittle.

ATBT

[RobP]

if you need to replace both sides anyway, consider a Delphi WeatherPak connector.