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Electrical gremlins NEED help.
#1
Ok trying to gte my 73 original vert ready to take to a local show for mustangs next weekend on the 19th. This car sat for 25 years and po had hacked the wiring to pieces adding MSD, burglar alarm boom box with 2 amps, radar detector, went from no gauge to gauge. So the harness was a mess. So after much searching I did find a harness for this car. 351 C auto, gauges, tach, air, convience group, convertible. 
So I pulled the dash and went through the harness cleaning every connection with steel wool or a stainlees brush. Every ground was to bare metal. I got the entire harness including lights and engine. I got it all back together and it blows fuse # 6 which the Ford manual says is for stereo, turn signals and back up lights, 15 amp fuse. I get no fire to turn the engine ever. Nothing when you turn the key. The turn signal switch is a NOS Ford unit that I also replaced. Odd thing is that the radio buzzes and is on with the fuse blown. The other odd thing is when you hook up battery the right turn signal blinks does not matter if the lever is on or not and the fuse is out of the slot for turn signal.
THIS OLD GUY NEEDS HELP, LOL. Where do I look? Before I put the harness in I went over the harness and wrapped it again. No splices not cut wires all grounds are there and clean. Where do I go first? The po did change from fmx to C4 and never got the right lock rod for transmission. Do I need to jumper something to clear out the safety switch? I am lost when it comes to the wiring diagram. If it was on one sheet maybe but the multiple pages I am lost.
The big thing I do not understand is the right turn signal all the time key on or off, and nothing to the engine will not turn over. The MSD did not have the tach adapter when I got so I ordered one and wired as they show for a + connection on a tach which is what the Ford manual shows. The car started and ran before I put the unhacked wiring in but the gauges had got so hot they melted the center cluster just short or a fire and the tach did not work.

When a man is in the woods and talks and no women are there is he still wrong??
Tongue
David
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#2
Carolina mountain mustangs,
regardless of weather the turn signal fuse is in there or not you still have power at the turn signal switch thru
the brake light circuit .
the ignition has to be on for the turn signals to operate, the ignition does NOT have to be on for the brake light circuit to work.
could be as simple as a shorted filament in one of the rear bulbs.
Boilermaster
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#3
Carolina mountain mustangs,
What shifter do you have ?
Fmx uses neutral/ reverse light at the shifter and C4 has switch located on the transmission shift shaft.
is it possible that you have BOTH and one is not even plugged in ?
Might not hurt to remove the shifter cover and see what is in there.
Did you adjust the neutral switch ? or chek to see if you had power there with the key on ?
                Boilermaster
  Reply
#4
The fuse for the radio, turn signal flasher, wiper shut-off, backup lights is the top-most left fuse, Fuse 1. Fuse 6 is for RUN-only things, mostly seat-belt warning, and master cylinder indicator lamp.

See if you can jiggle the shifter, as perhaps your NSS is out of adjustment. If still no go, put it in neutral and hot-wire the car to see if it runs. I interpret your message to mean that you cannot get the starter to engage.

Also, be aware that the headlight and alternator harnesses must be swapped out for tach-configuration when the conversion was done from standard to tach.
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#5
(08-10-2017, 07:03 PM)boilermaster Wrote: Carolina mountain mustangs,
What shifter do you have ?
Fmx uses neutral/ reverse light at the shifter and C4 has switch located on the transmission shift shaft.
is it possible that you have BOTH and one is not even plugged in ?
Might not hurt to remove the shifter cover and see what is in there.
Did you adjust the neutral switch ? or chek to see if you had power there with the key on ?
                Boilermaster

Thanks for the ideas of where to look.
Not sure on the shifter type but it is open now so I can probe the wires and see what is there. I did try having shifter in different locations but did not get any fire. I did notice there was a lot of wires coming to a curved switch under the shift indicator. Will check that this morning.
If the shifter is for the FMX what tells me that? I did see a Ford # on the switch in the shifter. I will also look for the switch on the transmission shift shaft. Thanks for giving me so ideas.
On the bulb short what do I look for there? I did clean all the sockets, grounds and bulb ends when I rebuilt the tail lights.
I was looking through parts and found another shifter that I bought that was said to be for C-4 it does not have the switch on it. I figured it had been removed. It does have the indicator light and wire.
I did check to see if all the plugs were connected going down to the transmission yesterday. Seems like there were three connectors that were square with probably 4 wires and on that was two wires. All were plugged together. These are the ones located on the left rear of the engine near the firewall.
I will have my coffee and breakfast and head out to see what I can find. I will let you know.

When a man is in the woods and talks and no women are there is he still wrong??
Tongue
David
  Reply
#6
(08-10-2017, 07:28 PM)midlife Wrote: The fuse for the radio, turn signal flasher, wiper shut-off, backup lights is the top-most left fuse, Fuse 1.  Fuse 6 is for RUN-only things, mostly seat-belt warning, and master cylinder indicator lamp.  

See if you can jiggle the shifter, as perhaps your NSS is out of adjustment.  If still no go, put it in neutral and hot-wire the car to see if it runs.  I interpret your message to mean that you cannot get the starter to engage.

Also, be aware that the headlight and alternator harnesses must be swapped out for tach-configuration when the conversion was done from standard to tach.

Midlife, my seat belt warning buzzer works and no fuse in #6. I was going by what is in the Ford shop manual #6 was listed as turn signal, flasher, wiper.
I will probe the solenoid I am pretty sure I have fire to the small terminal on it. I will short across and see if starter kicks in. Can you describe the difference between harness on alternator for tach? I got the entire harness under dash engine and lights when I bought it.
Thanks for your info you need to live closer to mountains, lol.

When a man is in the woods and talks and no women are there is he still wrong??
Tongue
David
  Reply
#7
(08-11-2017, 07:03 AM)Carolina_Mountain_Mustangs Wrote:
(08-10-2017, 07:03 PM)boilermaster Wrote: Carolina mountain mustangs,
What shifter do you have ?
Fmx uses neutral/ reverse light at the shifter and C4 has switch located on the transmission shift shaft.
is it possible that you have BOTH and one is not even plugged in ?
Might not hurt to remove the shifter cover and see what is in there.
Did you adjust the neutral switch ? or chek to see if you had power there with the key on ?
                Boilermaster

Thanks for the ideas of where to look.
Not sure on the shifter type but it is open now so I can probe the wires and see what is there. I did try having shifter in different locations but did not get any fire. I did notice there was a lot of wires coming to a curved switch under the shift indicator. Will check that this morning.
If the shifter is for the FMX what tells me that? I did see a Ford # on the switch in the shifter. I will also look for the switch on the transmission shift shaft. Thanks for giving me so ideas.
On the bulb short what do I look for there? I did clean all the sockets, grounds and bulb ends when I rebuilt the tail lights.
I was looking through parts and found another shifter that I bought that was said to be for C-4 it does not have the switch on it. I figured it had been removed. It does have the indicator light and wire.
I did check to see if all the plugs were connected going down to the transmission yesterday. Seems like there were three connectors that were square with probably 4 wires and on that was two wires. All were plugged together. These are the ones located on the left rear of the engine near the firewall.
I will have my coffee and breakfast and head out to see what I can find. I will let you know.
David if the shifter has a switch in it, that is the switch for an FMX
The C4 and C6 nuetral safety switches mount on the side of the transmission
Here is a pic of the FMX switch
[Image: Neutral%20Safety_lg.jpg]
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#8
(08-11-2017, 07:43 AM)OMS Wrote:
(08-11-2017, 07:03 AM)Carolina_Mountain_Mustangs Wrote:
(08-10-2017, 07:03 PM)boilermaster Wrote: Carolina mountain mustangs,
What shifter do you have ?
Fmx uses neutral/ reverse light at the shifter and C4 has switch located on the transmission shift shaft.
is it possible that you have BOTH and one is not even plugged in ?
Might not hurt to remove the shifter cover and see what is in there.
Did you adjust the neutral switch ? or chek to see if you had power there with the key on ?
                Boilermaster

Thanks for the ideas of where to look.
Not sure on the shifter type but it is open now so I can probe the wires and see what is there. I did try having shifter in different locations but did not get any fire. I did notice there was a lot of wires coming to a curved switch under the shift indicator. Will check that this morning.
If the shifter is for the FMX what tells me that? I did see a Ford # on the switch in the shifter. I will also look for the switch on the transmission shift shaft. Thanks for giving me so ideas.
On the bulb short what do I look for there? I did clean all the sockets, grounds and bulb ends when I rebuilt the tail lights.
I was looking through parts and found another shifter that I bought that was said to be for C-4 it does not have the switch on it. I figured it had been removed. It does have the indicator light and wire.
I did check to see if all the plugs were connected going down to the transmission yesterday. Seems like there were three connectors that were square with probably 4 wires and on that was two wires. All were plugged together. These are the ones located on the left rear of the engine near the firewall.
I will have my coffee and breakfast and head out to see what I can find. I will let you know.
David if the shifter has a switch in it, that is the switch for an FMX
The C4 and C6 nuetral safety switches mount on the side of the transmission
Here is a pic of the FMX switch
[Image: Neutral%20Safety_lg.jpg]

Don,
That switch is there so I guess I should remove and not plug that in and use one on the transmission. I do not know if it is there have to check and see. Thanks for the pic.

When a man is in the woods and talks and no women are there is he still wrong??
Tongue
David
  Reply
#9
I got under the car and there is not switch on the linkage to the transmission.
When I turn the key on I have voltage to the solenoid but when I turn key to start starter will not engage. When I short between the solenoid and battery starter turns engine.
So if I were to jumper the switch for the transmission or shifter should the car start? What terminals do I jump on the connections?
I have another convertible with gauges sitting right by this car so I can check the alternator wiring when I go back, it has a C-6.

When a man is in the woods and talks and no women are there is he still wrong??
Tongue
David
  Reply
#10
I believe on the FMX switch you jumper the R-LB (Red & Light Blue) for the NSS.
'73 Grandé H Code. Headman long tube headers, T-5 Transmission, 3.70 Traclok, Lowered 1" all around, Aussie 2v heads w/ 2.19 intake, 1.71 exhaust, screw in studs, full roller cam 608/612 lift 280/281 duration LSA 112, 750 CFM double pumper, Holley Street Dominator intake.

'73 F code convertible. Bright red. Needs total restore. (IE HOT MESS)

- Jason
  Reply


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