73 way back machine
Melting Slicks
Joined: Apr 2001
Posts: 2,030
Likes: 363
From: Lubbock Texas
Hey Bird,
You were asking some questions about '73 wiring in another thread. I lost track of which thread that was so decided to post here. I've attached a pdf of some '73 wiring diagrams that might help you.
As far as the charging circuit, the charging wire goes from the alternator to the horn relay and then to a circuit breaker located on the driver's side firewall near the top. From there it goes to the starter. One lead of the ammeter connects to the charging wire that is between the circuit breaker and the starter. I believe this wire is black with an orange fusible link where it connects to the charging wire. The other ammeter lead connects to the horn relay via a fusible link and I believe this lead is black with a white stripe. On my '73 there is another wire out of this fusible link over to the alternator connector.
Not sure my '73 is completely stock with respect to the wiring and Bubba has certainly been around so the above description might not apply to the '73 you are working on. But, holler if you need me to look at something on my car. I'm in the process of cleaning up the wiring under the hood now. Also installing a #4 charging wire.
DC
You were asking some questions about '73 wiring in another thread. I lost track of which thread that was so decided to post here. I've attached a pdf of some '73 wiring diagrams that might help you.
As far as the charging circuit, the charging wire goes from the alternator to the horn relay and then to a circuit breaker located on the driver's side firewall near the top. From there it goes to the starter. One lead of the ammeter connects to the charging wire that is between the circuit breaker and the starter. I believe this wire is black with an orange fusible link where it connects to the charging wire. The other ammeter lead connects to the horn relay via a fusible link and I believe this lead is black with a white stripe. On my '73 there is another wire out of this fusible link over to the alternator connector.
Not sure my '73 is completely stock with respect to the wiring and Bubba has certainly been around so the above description might not apply to the '73 you are working on. But, holler if you need me to look at something on my car. I'm in the process of cleaning up the wiring under the hood now. Also installing a #4 charging wire.
DC
Thread Starter
Le Mans Master
Joined: Dec 2006
Posts: 8,837
Likes: 1,028
Cleaned the old sensor spot with a tap, and installed plug with PTFE paste.
Drilled 1/8" hole in USA made 160* stat.
This helps with bleeding air, and vents steam if the stat fails.
Installed new switch and old gauge sensor. I like PTFE paste. It lubricates and seals well.
Your only holding 15lbs, so snug is fine.
The sensors work fine, as the threads cut thru the paste. Just try screwing it down and prevent conductivity. Not gonna happen.
Thread Starter
Le Mans Master
Joined: Dec 2006
Posts: 8,837
Likes: 1,028
Sensors set correct.
5 thread engagement with flat washers to prevent galling.
Gaskacinch to hold gasket on housing.
white grease on the manifold.
I do it this way so you can pop it off if the stat fails, or to flush the system easily.
Team Owner
Joined: Jan 2006
Posts: 39,346
Likes: 171
From: Into the Mystic And yet, despite the look on my face, you're still talking TN
St. Jude Donor '09 thru '25
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Thread Starter
Le Mans Master
Joined: Dec 2006
Posts: 8,837
Likes: 1,028
.
Team Owner
Joined: Jan 2006
Posts: 39,346
Likes: 171
From: Into the Mystic And yet, despite the look on my face, you're still talking TN
St. Jude Donor '09 thru '25
Thread Starter
Le Mans Master
Joined: Dec 2006
Posts: 8,837
Likes: 1,028
Changed the fuel pump to a stock unit with return.
Luckily I had a set of molded s hoses from Doc in stock
Used the old "grease on the push rod" trick to hold it in place.
Of course, sometime the 3/8" hard line was cut back.
A new piece of tubing will be spliced in with a brass compression union.
Just one more fire to put out.
Thread Starter
Le Mans Master
Joined: Dec 2006
Posts: 8,837
Likes: 1,028
Today I took a 24" piece of brake line, rolled a proper bead in the hose end, bent it to follow the return line, and tied it in with a 3/8"x3/8" compression coupling.
Tied in the "s" hoses, and now the pump is complete.
I need to find a clamp for on top of the frame rail.
Anyone reading this please let me know. Used is fine. Go car, not show.
Thread Starter
Le Mans Master
Joined: Dec 2006
Posts: 8,837
Likes: 1,028
The Gates lower hose was 2" too long at the pump.
No biggie. Cut 2" off with a knife. It also had no spring, so I jambed in a NOS hose spring.
If you do this, just install it half way up the bend
I had a car in 73 come in the shop with the most hideous noise. His hose was so soft, the spring migrated to the water pump, wrapped around the impeller, and was just crazy loud.