Can You Identify This Under Dash Wire? - Page 2 - Ford Muscle Forums : Ford Muscle Cars Tech Forum
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post #16 of 22 (permalink) Old 05-30-2019, 07:02 PM
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Re: Can You Identify This Under Dash Wire?

more like 7 volts
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post #17 of 22 (permalink) Old 05-30-2019, 07:25 PM
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Re: Can You Identify This Under Dash Wire?

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Originally Posted by extech View Post
more like 7 volts
Yes, of course.

My mistake.
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post #18 of 22 (permalink) Old 06-04-2019, 04:29 PM Thread Starter
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Re: Can You Identify This Under Dash Wire?

[quote=galaxiex;1629580395]
Quote:
Originally Posted by fordwilly View Post

If the points are open when you make that test with your meter, then the voltage at the coil + will read full battery voltage.

There is a voltage drop through a resistor ONLY when it is a complete circuit.

If the points are open, the circuit is not complete.

You would have to make sure the points are closed and re-do the test. Or simply put a jumper wire from coil minus to engine block ground.

If the resistor wire is in the harness and hooked up, then with the points closed, (or a jumper to ground)
you should get a reading of something less than battery voltage. ~9 or 10 volts.
Well, using the above method (I thought) I was still was getting a high 12 v battery voltage. I thought either I don't have the resistor or I'm still testing incorrectly. So I thought some more. I had a jumper from engine grounding point to negative coil terminal. Then I just barely raised the coils positive "push on" positive connector so I could slip my tester positive lead under it to make contact with the post. Then put the tester minus lead to the engine ground. Bingo 6.8 volt reading. --- Did I do it right????

On another note an interesting thing happened while I was checking the coil area. Let me know if I'm just plain crazy here. --- Some coil/distributor wires were not routed the best way, so while re-routing them I pulled the main coil wire from the top of the coil, ( which I had never done before ) it came off too easy, and I discovered the copper connector was no where to be seen. It was sideways in the top L part of the boot, so it was never even in the coil 'hole" at all I thought. --- I again thought, an engine would not run at all without a coil wire, would it ???? When I had driven it in the past (bought it last December and it sat in my shop all this snowy winter) it would seem to run fair at lower speeds and if you got on it a bit it would flood the engine and stop. I have been thinking that it was my tri power floats and such all out of wack. Hmmm. So I just now took out the really rich fouled plugs and replaced with new. I have a couple more things to do before I drive it in a couple days. Kind of excited now. --- So OK, will the car run without the coil wire attached ????

[SIGPIC]
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post #19 of 22 (permalink) Old 06-04-2019, 07:35 PM
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Re: Can You Identify This Under Dash Wire?

if if the spark was contained in the dust boot., it will run. usually that no connect makes the voltage go way up and it is easier to have the spark jump out of the cable. if you run the engine at night, no lights on. you can see the sparks jumping out . if thats happening, the spark isn't going to the plug
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post #20 of 22 (permalink) Old 06-08-2019, 08:27 AM Thread Starter
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Re: Can You Identify This Under Dash Wire?

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Originally Posted by 1964Fastback View Post
Here's a link to one that has good reviews. Not very expensive but you have to buy two, so that's kind of annoying:


https://www.amazon.com/Ehdis-Relay-4...qid=1558125892


Here is a link that explains the pin numbering (about halfway down):


https://www.12voltplanet.co.uk/relay-guide.html


87 to the battery, 30 to the pump or fuse block, 86 to the line that's hot when the key is in run and 85 to ground.


I would say you need to find a line that's hot only with the key in the run position. You'd quickly drain your battery running the 10 amp pump if you left the key in the ACC position to listen to the radio, and the pump also ran in that position.


Pat
Ok, I'm confused. I'm getting ready to hook up the above Ehdis 4 post relay. I checked out this YouTube Video
and it clearly shows different connections than above. For instance the video says 87 is feed to your accessory that you are powering. not as stated above as the connection to battery positive power. Video says 30 to Battery Pos. and not as above stating 30 to the accessory you are powering. ---- I need help as I must have flunked the electric test in high school auto shop.

[SIGPIC]

Last edited by fordwilly; 06-08-2019 at 08:32 AM.
post #21 of 22 (permalink) Old 06-08-2019, 08:42 AM Thread Starter
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Re: Can You Identify This Under Dash Wire?

I apologize for the last post. That is not the video I posted. Have no idea what went wrong. The text is as follows.

Ok, I'm confused. I'm getting ready to hook up the above Ehdis 4 post relay. I checked out this YouTube Video and it clearly shows different connections than above. For instance the video says 87 is feed to your accessory that you are powering. not as stated above as the connection to battery positive power. Video says 30 to Battery Pos. and not as above stating 30 to the accessory you are powering. ---- I need help as I must have flunked the electric test in high school auto shop. Ill try the video one more time below.


[SIGPIC]
post #22 of 22 (permalink) Old 06-08-2019, 09:55 AM
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Re: Can You Identify This Under Dash Wire?

Functionally it doesn't matter if the battery goes to 87 or 30 and same with the accessory.

Technically, the correct way is to have 30 to the battery and 87 to the accessory.

So connect 30 to the battery and 87 to the accessory.
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