470 mercruiser rebuilt engine install questions

[aarons 470]

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[aarons 470]

Ok here is he section around old bolt regulator. I will be running a one wire alternator.
I labeled the only 2 I know from bolt regulator.
Colors don't seem to match up to merc manual.
I'll do the same with the other harness sections

Sorry about pic quality I have to do reverse picture from phone to get a low enough quality to work on site.

A is yellow and red
B Is purple and yellow
C is brown and the longest
D is the largest and red
Sense is lighter red
Output is faded orange

 

[aarons 470]

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[aarons 470]

Red and purple/yellow went to positive cool

E brown or dirty purple i "think" went to positive coil but not sure.

F is grey

G is green

 

[aarons 470]

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[aarons 470]

This is the second shortest section from harness/breaker plug.

H is black

I is 2 wires together red and other is tan or faded orange?

J is a purple that is capped off. Maybe for choke? Which my new carb has

 

[aarons 470]

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[aarons 470]

This is the section closest to plug.

K is black

L is 2 wires ran or off white?

M is a thicker black wire with a larger connector

N is brown/white

 

[aarons 470]

This is section closest to plug on harness

K is small black

L is 2 tan wires

M is a thicker black wire with larger connection

M is brown white white stripe

 

[aarons 470]

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[aarons 470]

I forgot to mention, I will be using a
Starter that has solenoid attached to it.

This harness Was wired for one without.

 

[alldodge]

Need to find out if your working with pre BIA or post BIA wiring. I would start first by ringing out the engine harness connector. Put one probe of the ohm meter in a pin and go around trying to find which wire is connected

A is yellow and red - ALT to Reg (not used)
B Is purple and yellow - Slave relay to Coil +
C is brown and the longest - Water Temp, pin 3
D is the largest and red - Bat at Starter post to Circuit breaker
Sense is lighter red - Should be Red/Purple going to Circuit breaker, pin 6
Output is faded orange - Tied in at starter or slave relay with Red/Purple

Red and purple/yellow went to positive coil - Red resistance wire, Pur/Yel other end Slave relay to coil +
E brown or dirty purple i "think" went to positive coil but not sure. - Brown and shift interrupt switch
F is grey - Negative coil
G is green - See what pin it goes to, if no connection to engine plug could be Green/White to trim solenoid or if pin 8 then oil pressure sender

H is black - Ground
I is 2 wires together red and other is tan or faded orange? - See if Red goes to pin 4
J is a purple that is capped off. Maybe for choke? Which my new carb has - Agree to choke

I forgot to mention, I will be using a
Starter that has solenoid attached to it.

This harness Was wired for one without.

I would suggest getting a slave solenoid and wiring it in also

 

[aarons 470]

Yes I have the small slave that mounts to engine, and have the one starter.

Is there a diagram that shows the wiring on the small block Solenoid to starter solenoid hookups?

Thanks Dodge appreciate it. I'm hoping to scope this out tonight. My batteries are installed and hooked up to a switch. I still need to get grounds anchored then I can use meter.

 

[alldodge]

There are a few in the manual and I'm mostly using this one. Note it uses standard colors

 

[aarons 470]

On letter I, red does not go to pin 4. It went straight to positive coil.

the other wire tied into it (pink or really faded orange) goes back to harness. They both connect together into a yellow size a female connector,
See pic below.

This red wire looks like it was added. The red wire doesn't attach to harness it runs outward and mates up with positive coil/ purple yellow.

To clarify, wire D goes directly to large post on starter solenoid that's attached to starter?

And is the sense voltage wire from the old regulator now void? It is red and purple right before it goes into breaker.

And E the brown wire that you said goes to shift interuptor, it is the gray wire from the drawing?
Thanks

 

[aarons 470]

No Title

 

[aarons 470]

And are k L M N still up in the air?

 

[alldodge]

K is small black - should be Ground, all black should be ground unless it was added
L is 2 tan wires - Don't know
M is a thicker black wire with larger connection - Ground
M is brown white white stripe - Trim sender to gauge

Most all this comes down to figuring out what wires go which pin on the engine harness. Once we know which wire goes to which pin the rest can be figured out. I think were running into color fade along with some wiring being added over time. I know its ruff to figure out and your looking at it, its even harder for me.

To clarify, wire D goes directly to large post on starter solenoid that's attached to starter?

The wire being a Red should mean it is battery voltage, which should connect between the starter post to the circuit breaker, or if you don't have a breaker it would go to the slave relay. Once power goes thru the breaker it changes to Red/Purple.

And E the brown wire that you said goes to shift interuptor, it is the gray wire from the drawing?

Gray wire should be the Tach wire from negative side of coil to pin 2

 

[aarons 470]

10-4, I really appreciate this help. I have research to do, figure out how to use an ohmmeter LOL

I'll get the harness plug traced out with that

 

[aarons 470]

On another subject, This is interesting.My machinist 40 years experience, and the mercuiser mechanic at shop both say retorque on head not necessary.

I asked the merc tech why, he said today's gasket quality/design makes the retorque void.

Curious thoughts on this