Help
Just acquired an 82 spider and starting to run down it various quirks.
Issue that i'm currently working on is non functioning temperature guage.
Wire from senders on block are tied together under hood and go nowhere, so clearly this is part of the problem
It appears that the guage moves on less resistance and not more resistance as indicated in the manual and in a couple of threads on this board. If i ground out the green wire post on guage needle moves hard right.
Now my key questions are:
1) where under the hood should the green/white wire become visible and split off to the two senders?
2) where does the resistor that forms part of this circuit live?
3) what are the specs for resistor mentioned above?
4) is there any easy way to tell the temperature sender from the kill sender? It seems that there poision on the engine may not always be same (or they may be swapped)
5) does anyone have a list of resistance of sender at different temps?
Thanks for helping a new owner
Geoff C
Appears that
Looking for dummies guide for temperature guage wiring
- azruss
- Posts: 3659
- Joined: Sun May 30, 2010 12:24 pm
- Your car is a: 80 Fiat 2000 FI
Re: Looking for dummies guide for temperature guage wiring
Well this is what I think I have learned so far:
Resistor between cut off and sender lives in blue holder (similar to a fuse holder) above gas pedal.
This resistor appears to measure out at 320 ohms.
The guage reads higher as resistance is lowered:
120 degrees (on guage) is about 790 ohms
155 degrees (on guage) is about 385
190 degrees (on guage) is about 120
225 degrees (on guage) is about 108
red on guage is about 70
Don't check resistance of sender when ignition is off and wires attached as something else gets closed in circuit giving a value that does not help.
And now time to replace the sender and see if all my theory works well in practive
Resistor between cut off and sender lives in blue holder (similar to a fuse holder) above gas pedal.
This resistor appears to measure out at 320 ohms.
The guage reads higher as resistance is lowered:
120 degrees (on guage) is about 790 ohms
155 degrees (on guage) is about 385
190 degrees (on guage) is about 120
225 degrees (on guage) is about 108
red on guage is about 70
Don't check resistance of sender when ignition is off and wires attached as something else gets closed in circuit giving a value that does not help.
And now time to replace the sender and see if all my theory works well in practive
-
- Posts: 48
- Joined: Tue Jul 12, 2011 5:21 pm
- Your car is a: 1975 124 Sport Spider
- Location: SE WI
Re: Looking for dummies guide for temperature guage wiring
Geoff,
Would it be possible to post a picture of this resistor? I haven't been able to identify it.
Thanks
Rob
Would it be possible to post a picture of this resistor? I haven't been able to identify it.
Thanks
Rob
1975 124 Sport Spider<br/>
1979 MGB<br/>
1981 Mazda RX-7<br/>
2002 Chevy Blazer<br/>
2003 Mazda 6
1979 MGB<br/>
1981 Mazda RX-7<br/>
2002 Chevy Blazer<br/>
2003 Mazda 6
Re: Looking for dummies guide for temperature guage wiring
Hope these help The first one shows where it hides - over the black box above accelerator
In the second the tube on the right hand side is the resistor holder
http://www.flickr.com/photos/65941128@N06/6003653488/
http://www.flickr.com/photos/65941128@N06/6003653452/
To tired to figure out why not displaying in post
In the second the tube on the right hand side is the resistor holder
http://www.flickr.com/photos/65941128@N06/6003653488/
http://www.flickr.com/photos/65941128@N06/6003653452/
To tired to figure out why not displaying in post
-
- Posts: 48
- Joined: Tue Jul 12, 2011 5:21 pm
- Your car is a: 1975 124 Sport Spider
- Location: SE WI
Re: Looking for dummies guide for temperature guage wiring
Thank you
1975 124 Sport Spider<br/>
1979 MGB<br/>
1981 Mazda RX-7<br/>
2002 Chevy Blazer<br/>
2003 Mazda 6
1979 MGB<br/>
1981 Mazda RX-7<br/>
2002 Chevy Blazer<br/>
2003 Mazda 6