Aftermarket wiring harness or connectors, IHRA

IHRA answers this part for 29 of its classes. 0 of those answers permit the part outright and 24 permit it with stated conditions, leaving 5 that do not. 4 of the ones that do not are classes we read as open rather than as refusing it. 4 are inferred from how the class is written rather than quoted from a rule naming this part.

Where it stands, class by class

29 classes, grouped where the same rule gives the same answer rather than listed one by one, because an answer that holds for a class usually holds for every class that borrows its rules.

What each answer below means

OEM part required: This comes off. Only the part the manufacturer fitted is allowed here.
Legal, with conditions: Keep it, but measure it: the rules permit this part only inside stated limits.
No rule, this is an open class: Probably keep it. The class carries no stock clause at all, so anything unlisted appears to be open. The rulebook does not say so in terms, and this is our reading rather than a permission anybody wrote down.

OEM part required 1 class

W.4 keeps the harness itself OEM, and aftermarket connectors may be fitted to it for reliability only, adding no signal, input or output. · W.4, W.4.2

Runabout Endurance

Legal, with conditions 18 classes

J.7, in the general rules for every class, names wiring as replaceable with aftermarket options, which overrides the closed-list default and covers replacement wiring. Connectors are not named on their own, and J.7 does not open added inputs or outputs, a different harness design or an ECU. · J.7

Legal, with conditions 3 classes

Replacement wiring is allowed under J.7, and this class also opens the ignition system and electrical box to modification or aftermarket parts and allows an aftermarket ECU, so wiring inside the electrical box and serving the ignition and ECU may change with them. The harness beyond those parts is held to J.7 replacement.

Ski GP · J.7, K.6.1, K.6.2
Sport GP · J.7, V.7.1, V.7.2
Runabout GP · J.7, X.5.1, X.5.2

Legal, with conditions 1 class

Replacement wiring is allowed as a maintenance part under J.7, and AA.4.1 keeps the ECU on its original connectors with no added input or output; J.7 opens no harness redesign and no ECU. · J.7, AA.4.1

Runabout Lites

Legal, with conditions 1 class

Replacement wiring is allowed as a maintenance part under J.7, and L.4.1 keeps the ECU on its original inputs, outputs and connectors; J.7 opens no harness redesign and no ECU. · J.7, L.4.1

Ski GP2

Legal, with conditions 1 class

Replacement wiring is allowed as a maintenance part under J.7, and T.4.1 keeps the ECU on its original connectors with no added sensor or input; J.7 opens no harness redesign and no ECU. · J.7, T.4.1

X2 Vintage

No rule, this is an open class 3 classes

The class states only what it bans and calls itself run what you brung, against a section DD preamble that says anything unlisted is illegal.

No rule, this is an open class 1 class

No restriction in section CC, and CC.1 permits any modification it does not restrict.

Freestyle · CC

Aftermarket wiring harness or connectors: if the rule your class applies reads differently to you, or the rulebook has changed since this was read, ask. We answer with the section we read it from, or that we have not read it. Ask a rules question.

Every IHRA class · where the rulebooks differ · checks on parts the shop sells · how this site reads a rulebook.

Electrical · two and four stroke · legal in 24 of 29 answered, all with conditions