1974 Evinrude 70 HP Charging system install

[SHSU]

Howdy All,
I have a 1974 70 HP Evinrude (70442M). Works great but looking to add the ability to charge batteries while under way. I see that I can purchase a kit that comes with a new stator, rectifier, and voltage regulator. Only issue I have is I don't know how to install it. Stator/Rectifier I think is straight forward, the voltage regulator though I am unsure of placement or wiring. My Evinrude Manual doesn't show/provide any guidance on the charge system option since its aftermarket.

Any pictures showing currently working/installed system would be appreciated or a manual/installation guide would be awesome.

Thanks in advance

SHSU

 

[racerone]

They all left the factory with the battery charging system.----Have you done any testing to see if anything is wrong with yours ??

 

[saltchuckmatt]

Pictures of the motor with the cowling off will help immensely.

 

[Crosbyman]

your engine should have 2 yellow wires connected to this rectifier which will charge your battery !! ...usually wired back to the main incoming B+ post on the solenoid (see the fat red cable another one to a fuse) .

 

[SHSU]

Thanks all
I was under the impression it was an aftermarket mod because of the voltage regulator. I will have to test it when I pull the boat out again. Any reason why the kit has a voltage regulator (581307) vs what is already common on the engine?

Thanks,

SHSU

 

[Crosbyman]

rectifier/regulaors are fine for stabelizing the volts to protect electronics but a simple full wave rectifier will use the battery as a kind of buffer.

if you do get high volts messing up electronics you could get a rectifier- regulator and mount it somewhere . ( lots of them on Amazon or go OEM $$$)

https://www.amazon.ca/Aramox-Rectifier-19711975-Regulator-Evinrude/dp/B0BYSLWZ45/ref=sr_1_19?crid=2YRTZLID84FDW&dib=eyJ2IjoiMSJ9.MwR9GIgh2PZvTE7eaP3sPVZoJ7F4Mipg7uQBi-XrHpnxefHzm6gxEU0e9LAfE8fodYYL_k7FauPoJpLmUb93AOrOZbnHdyyF-8wvXuo44i49MBBXjZtDxNR_Z2_vDTtftFpVt90ey1Ed3WV2ZhIcY-XXFsKuGfRxFTdRlYZJG1vMjBLByPmexPWvd9u_AGYFUuniaBYZLGlKEoFQYAzzPj_-4FVZZz0AUKBagL3VCJRIuTcq-kHemyTczkgLzXXHTYfcC4c8VnXoASd3vLGxgYV4mqIZ7unt2VOSPtRtAck.quPaShpDZgxDM6pdFc1G-O8Hp5tRhW8UQr7R1ZSp3UE&dib_tag=se&keywords=marine+voltage+regulators&qid=1733239176&sprefix=marine+voltage+reculators%2Caps%2C157&sr=8-19

 

[F_R]

Your motor probably has the optional high output alternator kit installed

 

[SHSU]

Ah, so the regulator is for the High output vs the standard. Still need to pull the boat out, but good to know I should see volatge coming back to the battery from the engine while running.

Thanks,

SHSU

 

[saltchuckmatt]

You don't see much especially at idle. I hook up my meter and watch it slowly work it's way up.

It's not like a car.

 

[SHSU]

Good to know, any idea what I should see at idle vs at speed?

SHSU

 

[saltchuckmatt]

Amperage goes up but voltage is negligible. Rectifier works with the battery to stay within limits. Some of it is above my pay grade.

It will get over 13 volts.

 

[SHSU]

Gotcha, thanks

SHSU

 

[cyclops222]

A RECTIFER converts the AC voltage from under the flywheel. To a series of pulsating D C volts to be regulated by a Regulator Module. Somewhere on the engine. There usually is a fuse holder somewhere in the red wire circuit. To blow out a fuse if a dead battery is being charged. If a battery is really run down ? like 12.00 vdc.
First charge it up on a REAL 120 vac charger to full charge. Let it rest for several hours. Then check water level in each cell. If low ? Add a correct amount. You now have a fully automatic battery charger on your boat.

 

[cyclops222]

My old Evinrudes Will go right past 18 volts as the battery nears full charge. If you have dead night lights " Your battery is WAY WAY overcharged. I have small digital dash mounted volt meters. I have a resistor in series to drop the volts down to 15 vdc when needed.

 

[SHSU]

Thankfully never had dead lights. Just always believed the enigne didn't provide any recharge. Will need to check the voltage when I get it back out sometime.

SHSU