Author Topic: Water sender wire?  (Read 476 times)

Ryoko

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Water sender wire?
« on: January 13, 2018, 04:30:57 PM »
I'm trying to get the water temp sender to work on my 81 T/A. The previous owner did an engine swap from a 305 to a 350SBC. The water sender is there, but I can't find the wire. Where does this normally live? (I suspect they cut it.)

Grand73Am

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Re: Water sender wire?
« Reply #1 on: January 13, 2018, 05:57:53 PM »
This is a 79 with a 403, but I'd bet it's the same since the sender would be in the same area on a Chevy. It's a dark green wire that comes out of the black wire loom on the driver side.

Steve F.

Ryoko

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Re: Water sender wire?
« Reply #2 on: January 13, 2018, 06:14:41 PM »
I've been looking for a dark green wire, but it's hiding. I think part of the problem is that the alternator is now on the passenger side instead of the driver side, so I suspect there's some monkey business going on with the loom. However, your picture shows the wire is (or at least was) part of the alternator loom which gives me a place to start looking.

Thanks.

Grand73Am

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Re: Water sender wire?
« Reply #3 on: January 13, 2018, 06:18:12 PM »
Yes, I forgot about the Chevy having the alternator on the passenger side. So the loom was probably on that side and the dark green wire ran over from there to where the temp sender is. Good luck.
Steve F.

firebirdparts

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Re: Water sender wire?
« Reply #4 on: January 13, 2018, 07:24:22 PM »
It comes out of the fuse block.  The engine side of the harness only has a few wires.  You might try to trace it from there.  It is hard to see the fuse block though.
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Re: Water sender wire?
« Reply #4 on: January 13, 2018, 07:24:22 PM »

Ryoko

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Re: Water sender wire?
« Reply #5 on: January 13, 2018, 08:20:45 PM »
I need to pull the wheel well on the left front anyway to get to the zbar since it needs attention. That should make it easier to see the fuse block.

Jack

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Re: Water sender wire?
« Reply #6 on: January 16, 2018, 12:50:55 PM »
Will not help as it's blocked by the booster. Just a crappy location, you have to struggle some unfortunately.




Regards, Jack

Ryoko

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Re: Water sender wire?
« Reply #7 on: January 16, 2018, 10:21:19 PM »
Actually, I was able to see the fuse block with the wheel well removed. I found the wire. It's not green. It's black on mine. I think the color changed as part of the revision to the wiring harness on the 81's when they started to get the computer engine controls.

81Blackbird

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Re: Water sender wire?
« Reply #8 on: January 18, 2018, 09:06:06 AM »
The temp wire should have run across the driver side of the block and connected to the sending unit between #1 and #3 cylinders.
Being I still have the OEM harness on the '81 the wire is green but black works too if it's the temp wire.
« Last Edit: January 18, 2018, 09:10:51 AM by 81Blackbird »

Ryoko

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Re: Water sender wire?
« Reply #9 on: January 18, 2018, 02:39:41 PM »
At the end of the day, it didn't matter. I think I found the wire. But as it turns out the PC board on the back of the cluster is in poor condition. So even if the wire is attached and correct, it's not going to work.

Re: Water sender wire?
« Reply #9 on: January 18, 2018, 02:39:41 PM »
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