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Joined: Oct 2016
Posts: 19
Likes: 1
Novice
G'day all, I have in the workshop a Rover Regal 800 I think it is (stickers are missing).It is Key start self propelled, The customer told me it won't start on key but it will on pull start. I checked the battery it failed load test, so I started the mower and checked the voltage coming out from the wire harness its 35V DC so i reckon with my limited knowledge its overcharging and cooking the battery. I can not find a spare parts list online even a rover dealer didn't have anything useful for it. The model is 12AEE1LI333. It has a MTD engine on it, could it have a faulty alternator on it? does it have a reg/rec in wiring harness?. don't want to start pulling it down until I can get some info on it, so any help would be truly great thanks cheers Mike

Joined: Jul 2018
Posts: 2,090
Likes: 81
SENIOR TECHNICIAN
Hi Mike

Engine is a chonda - pretty sure they are a Loncin 1P65FA - which does have an MTD number (2P something)

Having been through a similar thing before, it is hard to search MTD rover if you aren't 100% on the ball and have tonnes of time


Have contacted a friend for you who has access - turns out if you look up the MTD engine number 2P65ht the parts come up

Here is a screen shot he has kindly sent

And after all that - Rover says their own part number isn't valid - or its NLA

Not good with electrics - but maybe a voltage regulator could be put in the wiring?

Attached Images
loncin.JPG (72.01 KB, 59 downloads)
1 member likes this: Handy Andy
Joined: Jan 2016
Posts: 7,476
Likes: 147
SENIOR TECHNICIAN
Never really got my head around how the charging on these things works, they usually only have one wire coming from the stator so I have never been able to understand it. I would be very surprised if it was putting out 35v DC are you sure that is the case and not AC. And were you testing this from the single wire?

Joined: Sep 2015
Posts: 2,070
Likes: 148
SENIOR TECHNICIAN & HISTORIAN
G'day Mike Tyler and Norm

One thing I have heard is that the parts manuals don't always bother listing the charging diode .

A single wire with a diode is generally a DC only system. The diode rectifies AC to DC for battery charging .This system is unregulated in that the energy delivered to the battery is totally dependent on engine speed• A red wire with a diode and black wire without a diode is a Dual Circuit system that offers DC for battery charging and AC to power lights•

A single wire feeding an electronic component (regulator/rectifier) is a rectified and regulated system which is less dependent on engine speed than the DC only system• Two wires of the same colour feeding a regulator/rectifier is a rectified and regulated system that offers even more energy.

https://www.briggsandstratton.com/eu/en_gb/support/faqs/browse/charging-system-alternator-test.html

http://web.missouri.edu/~schumacherl/276781SingleCylinderOHV.pdf

Cheers
Max.

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Z SingleCylinderOHV_2 pdf 1.jpg (57.96 KB, 44 downloads)
Joined: Jan 2016
Posts: 7,476
Likes: 147
SENIOR TECHNICIAN
Hi Max,
I'm still a bit in the dark on this system, what I do know is that on old English bikes you need about 30v ac from the alternator to achieve 13/14 v dc from the regulator. This system is similar to the mower type. Some of the Japper bikes can punch up to 80v ac before it is rectfied and regulated

Joined: Oct 2020
Posts: 125
Likes: 14
Apprentice level 2
Hi All

Not sure if this will help.

This is for a Honda but does mention and deal with OEM as well.


mich

Attached Images
Charging troubleshooting.pdf (2.34 MB, 4 downloads)

Only hurts till the pain's gone.

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