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Thunder Heart Performance Complete Electronic Harness Controller

J&P Cycles Part Number: 381-001

Manufacturer Part Number: ASM4250D


Gold Club Price: $298.79

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Description for Thunder Heart Performance Complete Electronic Harness Controller

• Performs all fuse, relay and flasher functions in one small module

• Electronic module utilizes all surface mount technology and microprocessor which eliminates cumbersome relays and flashers

• High-tech circuit interrupters replace circuit breakers for more compact and less complicated wiring harness

• Improved serviceability, using industry standard AMP and Molex connectors for reduced harness clutter

• Provides more sophisticated flasher performance (signal cancel on second command, hazards, etc)

• Water resistant package and connectors for trouble-free operation in all conditions

• Diagnostic LEDs indicate short/overloaded circuits for easy troubleshooting

Product Specs

Product Specs for Thunder Heart Performance Complete Electronic Harness Controller

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Fitment Note:

This item is a universal/custom fit component, and does not have any direct standard/OEM model application. Some items may require modification and an advanced level of mechanical skill and/or knowledge for installation.

Fitment Questions?

With over 750 years of experience combined, our tech staff has the answers!

Customer Reviews

Customer Reviews for Thunder Heart Performance Complete Electronic Harness Controller

Overall Rating

5 out of 5 stars (based on 17 reviews)

5 stars (15)

4 stars (1)

3 stars (0)

2 stars (0)

1 star (1)

0 stars (0)


Very easy to use, and if you do run into an issue the customer service is outstanding

Updated my girl for desert heat should work great


Bought to replace the EHC on a 2003 Big Dog Bulldog. Got instructions from Thunderheart for moving 4 wires. EASY install. Used a ford tractor ignition switch to replace the BDM switch.


Bought to replace the EHC in a 2003 Big Dog Bulldog. Works perfect. I called Thunderheart to get the sheet to move a few pins around. Just followed the sheet and it works perfect. You need a new ignition switch. I bought a ford tractor ignition switch from tractor supply. Minor filing for fit.


bought 2 thunderheart ing. systems in the past and they worked for a while(mounths) and then had trouble with turn signals. right now allworks except the left turn signal. no signal coming from main componant

Again I havn't installed as yet and again the on line service for my questions about this item were great!...mates who know about these types of items tell me I did well buying this from you guys! stuff


Excellent product.


Super easy to work with. Made my job so much easier. I recommend it


Excellent product, made wiring my custom very easy and quick. If you're building a bike from the ground up, this is the way to go. Thanks J&P.

Great product


Great product made the wiring of my bike very easy. They took the guess work out and help me make quick work out of wiring the bike.


Didn't use the harness but the controler worked well. Great help on the phone.


Makes wiring the bike so much easier....comes in a nice case.


Works great! Easy to understand instructions, even for an electrical idiot (like myself).


Quite possibly one of the single best products one can get from J&P. This has everything you need for wiring a bike whether you're building one, customizing, or replacing a poorly designed OEM wire set.

biker mike 2010

it made wiring the bike very simple. all the wires are labeled so you know where they go. it is a great part to use if your building a bike.


Used this to wire my first custom built bike. Made wiring simple. Don't know how it could be made any easier. Well worth the money spent.

Instructions & Manuals
Important Product Notes

Once opened, electrical items cannot be returned, except in the case of a manufacturing defect.

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