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The Heart Horse 3M 12V 140Amp Split Charge Relay Kit is a high-performance dual battery isolator with smart voltage-sensitive relay technology. Designed for seamless charging of two 12V batteries, it automatically connects and disconnects at precise voltage thresholds (13.3V cut-in, 12.8V cut-out) to protect your starter battery while powering auxiliary devices. Its rugged IP68 waterproof and vibration-proof build, combined with universal compatibility and a full installation kit, makes it the ultimate power management upgrade for campervans, SUVs, boats, and more.
| ASIN | B0CF8F7B6N |
| Best Sellers Rank | 4,231 in Automotive ( See Top 100 in Automotive ) 8 in Car Relays |
| Brand | Heart Horse |
| Coil Voltage | 12 Volts |
| Contact Current Rating | 140 Amps |
| Contact Material | Copper Alloy |
| Contact Type | Voltage Sensitive |
| Contact material | Copper Alloy |
| Contact type | Voltage Sensitive |
| Country Of Origin | China |
| Current Rating | 140 Amps |
| Current rating | 140 Amps |
| Customer Reviews | 4.4 out of 5 stars 508 Reviews |
| Manufacturer | YYGS_AMZgb |
| Manufacturer Part Number | sku6197-yy |
| Minimum Switching Voltage | 13.3 Volts |
| Model Number | sku6197-yy |
| Mounting Type | Screw Mount |
| Mounting type | Screw Mount |
| Operation Mode | Automatic |
| Operation mode | Automatic |
| Wattage | 1680 watts |
S**R
Can recommend
Works perfect.
F**3
Good quality, easy installation
Super easy to install, watched a couple of YouTube videos and done it myself with in the hour.
D**N
Chaaaaaaaaaaarge!!!
Great kit and super easy to install. Charges both batteries up brilliantly. Good price and quality. Happy with purchase and definitely recommend.
J**O
Good switch
Works a treat quick insbtall no problems
C**R
Good
Good
A**R
See the result
Ray fit, great product . Love the voltage display and so do customers.
A**P
Easy to install. VW T5 instructions below.
Easy to install. All the parts you should need... but if your vehicle battery is in the engine bay (not in the cab/under a seat) you might need a bit more red cable. (I fitted to VW T5 and just had enough red cable. How I fitted to VW T5: Starting at the battery under the bonnet. I routed the red cable thru a rubber grommet under left (passenger) side of the windscreen scuttle panel. Then routed it under the carpet covering the wheel arch. Then under the plastic step and mounted the charger box to the plastic step in the passenger side door opening. Then located the leisure battery behind the passenger seat with cables from the charger box routed under the carpet... I hope this helps someone, otherwise I've just wasted 4 mins of my life.
M**T
Avoid!
I installed this item, it was faulty & drained my starter battery. Should have been a simple replacement from our other split relay charger that lasted for years (not this brand). Unfortunately I installed it past the return date, so now I'm stuck with a drained starter battery & a faulty split relay kit.
C**.
God kvalitet
Fungerar som beskrivs. Saknar dock utgång för extern indikation av status.
M**N
Split Relay charger
Exactly what i ordered very happy with it. and it arrived earlier than I expected it.
M**Ì
Ottimo prodotto
Funziona veramente bene, non ha nulla a che invidiare ai relè di ricarica più blasonati che si trovano in commercio. Ne ho già presi diversi e mai avuto problemi. Interessante il display che indica la tensione di lavoro. Ovviamente si spegne dopo alcuni secondi e per visualizzare bisogna schiacciare il bottone. Il led di funzionamento invece lavora in automatico come sale la tensione.
J**R
Worked till it didn’t. Lasted about 200 days in total…
***** UPDATE ******* Works as described. Nice to have digital display to confirm voltages. So far so good. Been installed a few months. ***UPDATE*** Installed last August 2025 and it’s end of March 2026 and it has failed! Comes with a 180 day warranty!!! About 200 days has passed since installed and it’s dead! I definitely would NOT recommend this product any longer as it has a very short life span and petty warranty. Keep on scrolling for a better brand or warranty at least….
C**E
Fout in schema
Bij ene schema is de startbatterij boven.... bij ander schema is het beneden
Trustpilot
2 weeks ago
2 months ago