Engine heating up and shutting down

[Jim]

Oops... you have the reg/rec combined unit. My bad, it does need to be connected for this test.

 

[suntosh]

I'll do this but some questions -
1. why is that screw called Green Wire Screw I dont see any green in the picture.
2. I am by myself should I do this before or after I idle start the bike.
3. I'll have to unscrew the plat that has yamaha written over it ? Thats where this is at .

 

[Jim]

1. The wire has green colored insulation on it.
2. Get some help. you have to hold the pliers, rev the engine... and hold the meter on the battery. I'm good, but I can't do all that. Get some help.
3. Yes

 

[robtattoo]

I'll do this but some questions -
1. why is that screw called Green Wire Screw I dont see any green in the picture.
2. I am by myself should I do this before or after I idle start the bike.
3. I'll have to unscrew the plat that has yamaha written over it ? Thats where this is at .

1. If you trace that wire back, it's green. It just has a heat shield on it at that end.

2. Not 100% clear on what you mean

3. Yes.

(Jim beat me to it)

 

[robtattoo]

So, the original connector for the finned reg/rec unit is under the left hand side plastic (below the seat).

Hang on, I'll get you some photos of my '81.......

 

[Jan_P]

I dont believe it is any of the connectors on the pictures you attached
Please look for one matching the 7 wires like that

It can sit on the frame tube going downwards between the Carburetors or there about

There might be slots fitting inside . That hanging connector But again be careful with the colors so one is not put wrong .It can damage the regulator

 

[robtattoo]

Pop off the left side panel & you should see 2 connectors......

The reg/reg block is the one on the right (7 wires)

The other doohickey your guy ripped off is situated under the right side panel......

And I believe (someone'll correct me) it's a fuse/relay for something non-charging related

 

[suntosh]

I dont believe it is any of the connectors on the pictures you attached
Please look for one matching the 7 wires like that

It can sit on the frame tube going downwards between the Carburetors or there about

There might be slots fitting inside . That hanging connector But again be careful with the colors so one is not put wrong .It can damage the regulator


View attachment 252280

There is not an free connector else where. Pics attached.

 

[suntosh]

Pop off the left side panel & you should see 2 connectors......View attachment 252281

The reg/reg block is the one on the right (7 wires)View attachment 252282

The other doohickey your guy ripped off is situated under the right side panel......View attachment 252283

And I believe (someone'll correct me) it's a fuse/relay for something non-charging relatedView attachment 252284

Nice bike. My connectors are connected with wires. Pics attached.

 

[robtattoo]

Looking at your pictures & wire colors, the reg/rec connector is the left hand one in pic 2. It also looks a hell of a lot like it has a reg/rec unit plugged into it too. Thrace those wires down & I'd almost guarantee it's there.

*edited because I'm unobservant

 

[suntosh]

Looking at your pictures & wire colors, the reg/rec connector is the left hand one in pic 2. It also looks a hell of a lot like it has a reg/rec unit plugged into it too. Thrace those wires down & I'd almost guarantee it's there.

*edited because I'm unobservant

There is a rectifier looking like object like a grill but thats where the wires are going.

 

[robtattoo]

There is a rectifier looking like object like a grill but thats where the wires are going.

Hard to tell from the pics, but it looks suspiciously like the very thing. It's certainly mounted in the right place & the wiring colors look good.
That kinda leaves me a little stumped where exactly dipshit pulled the other one from

 

[suntosh]

Hard to tell from the pics, but it looks suspiciously like the very thing. It's certainly mounted in the right place & the wiring colors look good.
That kinda leaves me a little stumped where exactly dipshit pulled the other one from

Look at the pics again. I have clearer ones.

 

[robtattoo]

Were I you, I'd go ahead at this point & try the brush to ground test like @Jim suggested.

 

[suntosh]

Were I you, I'd go ahead at this point & try the brush to ground test like @Jim suggested.

I'll do that tomorrow. I'll get some help.

 

[robtattoo]

Look at the pics again. I have clearer ones.

Thanks, that's definitely a reg/rec.

 

[Jan_P]

Looking at your pictures & wire colors, the reg/rec connector is the left hand one in pic 2. It also looks a hell of a lot like it has a reg/rec unit plugged into it too. Thrace those wires down & I'd almost guarantee it's there.

*edited because I'm unobservant

That sounds right to me --3 white is from stator I do believe ..and there was mention it was replaced so I Would split that connector look inside and clean it and make sure there is a connection . Maybe some connector grease.

For thinking out loud. The slap test seems to work is that not saying there is charging at the alternator but not passing further
Lets see but after the connector service please measure across battery again 3 - 4 k rpm trying to find more than 13.5 ish

 

[suntosh]

That sounds right to me --3 white is from stator I do believe ..and there was mention it was replaced so I Would split that connector look inside and clean it and make sure there is a connection . Maybe some connector grease.

For thinking out loud. The slap test seems to work is that not saying there is charging at the alternator but not passing further
Lets see but after the connector service please measure across battery again 3 - 4 k rpm trying to find more than 13.5 ish

Which connectors would you want me to service. Image 1 or 2. And can I check some power at the connectors ?

 

[Jan_P]

That one appears to be the one
And yes it should be possible to check power I am on the older wiring system and have not checked the wiring for this
But power on and bike stopped I do believe the brown or green shall have 12 V to ground and the black go to ground . low resistance
Can be wrong but is easy to check

I believe it is sending full force Voltage no start and then when starting the regulator adjust brown or green to 14.3 or so
When installed .But again not checked the wiring Schematic someone else perhaps chime in.

If problems I can google the Schematic

 

[jpdevol]

Like I dont have spare jumper wires but I have ordered them off Amazon - should be in tomorrow. - https://www.amazon.com/gp/product/B0971DBWDW/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1

The regulator has been removed so it's already being passed. So maybe tomorrow. Like I need to know in detail how to do this test. for eg.

1. one alligator clip clips on the green wire and the other end is grounded like maybe clipping on a metal on the bike and then how do you measure using the multimeter. Black on what and red on what.

Sorry: Fri night = dinner with the Mrs. The top brush screw (brown) on your late model, Type A, regulator is switched constant power (+12VDC) the regulator is supposed to provide variable ground on the bottom brush screw (green wire), The jumper test is simply bypassing the regulator function and providing mechanical ground to the green wired brush (Jim's pliers do the same thing). However a proper charging system needs a regulator, so I'm a bit mystified as to why and how the previous "mechanic" bypassed the regulator function. Perhaps more discussion on thiat is in order before we proceed with other steps in an assumed OEM charging system. In short: if we supply 12VDC to the brushes on the top (brown) wire and ground the bottom (green wire) we should produce lots of DC volts at the battery (red from rectifier) and ground.(battery negative teminal).....