Honda ST1300A/electrical

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Honda ST1300 Electrical wiring diagram (colored)

Battery[edit | edit source]

Fully charged battery: 13.0 - 13.2V Under charged battery: < 12.3V

Customization[edit | edit source]

I have a Battery Charger Lead (SAE). This makes it simple to attach a battery tender during bike storage. The charger lead is also fused (10amp) inline.

New Stuff / Old Stuff[edit | edit source]

Trying to figure out what wiring was already done (and removed!). There is one hole in the glove box - plugged with a rubber grommet. That one is about an inch or so. There are three holes cut into the locked compartment. The 1 1/4" bottom hole is sealed with duct tape. There are two more holes fore and aft at the top of the compartment.

Maybe I should get this $20 "Quartet" simplified harness from Eastern Beaver. It is made to simply connect to the existing wiring harness' "accessory" connector (located under the left side front cowl) and provides two outputs: a switched and an unswitched. Mating connectors and terminals are included so you can wire up whatever you want.

Excess Electrical Capacity[edit | edit source]

Excess Electrical Capacity (EEC) is the amount of excess electrical power your vehicle has in reserve to power additional devices (appliances) without draining the vehicle battery. This number varies widely depending on the manufacturer, model and sometimes model year of the vehicle. Excess Electrical Capacity is defined as (Excess Electrical Capacity) = (charging output) - (common operating load).

From section 19 Battery/Charging System in the service manual, my alternator is rated at 0.742kW/5,000 rpm In other words, the bike will generate 742 watts at highway revs.

Honda ST1300[edit | edit source]

Peak Charging Output - Common Operating Load = Excess Electrical Capacity
740 watts ?? ??
low RPMs with heated grips on high ?? less
740 watts savings from LED headlights ?? more

I only want to power a phone (3 watts), GPS (6 watts), and maybe a music player (3 watts), so there will be plenty of excess capacity. However, some things like heated garments or lights draw a lot of power. If you want to have your laptop computer charging in the trunk while riding, it could draw 100 watts - so know what load you are adding to the system and how much capacity you have so that you don't drain your battery while riding.

Outlets[edit | edit source]

Today's electronics (phone, GPS) typically charge off USB type A or type C connectors. You can purchase a charging receptacle with wiring to connect directly to your battery. Most have an inline SAE connection.

Cigarette Lighter[edit | edit source]

Officially termed the Automotive Accessory Receptacle, back in "the old days", every car had a cigarette lighter. You push in the lighter, it gets glowing red hot inside and pops out like toast from a toaster. This would allow you to light up your cancer sticks while driving without causing a fire (even before the disposable cigarette lighter). All sorts of things from inflators to CB radios or radar detectors ran off the cigarette lighter adapter. This is obviously old technology in 2024.

Coaxial[edit | edit source]

SAE[edit | edit source]

PowerLet[edit | edit source]

One of the 'standard' (widely used) power adapter formats besides Cigarette Lighter and SAE is the 'PowerLet'. PowerLet is the common brand name for ISO 4165. (Other common brands include 'Hella plug' or 'BMW DIN plug'). It is shorter and smaller diameter than the "Cigarette Lighter".

PowerLet is a company that offers a range of products - including products for the ST1300

It is possible to fit a PowerLet just below the glove box of the ST1300. See these excellent photos on the ST Owners forums

One item I might want to get is the dual outlet Honda ST1300 Dual Rear Kit PKT-028 from PowerLet that mounts under the rear suspension pretension adjuster (so left side of the bike). This would offer power for both riders. But, it is not available any more and a coax power supply would probably be better anyway.