Is there more than 1 wiring harness on the car?

I have read places there is a smaller harness as well as the major harness?

I assume both have the biodegradable problems?

Biodegradable insulation exists with the upper harness, lower harness (starter, alternator, oil level) and throttle actuator.

Sent from my SM-A515U using Tapatalk

The lower harness is just a few wires and only 3 wires in that bundle go bad. Easy to fix. The starter, battery and alternator wires seem to be good

__________________
1993 e300
1995 e320
1994 e320
2006 s500 4matic
2004 Jeep wj overland
2001 Ducati 748
2004 Honda shadow aero

Your car has 10 or more harnesses. It's not a lawn mower.

Actually it's all the wires in the car. The reason why the ones around the engine fail is due to heat. Newer benzes (after 1997) have upgraded wires only in high heat areas. Other areas they still use the bio wiring.

is this the part? https://bit.ly/2WQlrdW
or are there are more?