Notes On Additional Wiring In The Engine - Hino Motors 300 Series Mounting Manual

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NOTES ON ADDITIONAL WIRING IN THE ENGINE COMPARTMENT
Since the engines in HINO trucks are covered with sound
arrest plates, the engine compartment tends to heat up.
Avoid wiring in the engine compartment if possible.
Additional wiring harness or cable should be kept away from
heated elements, and should be wired along the main harness.
KK-XZU215C