Repairing the Rear light wiring loom

Today I did a repair I've been putting off for a while. The rear light wiring was so tatty is was embarrassing. I was also concerned it could failed and leave me with no lights. Since I've also done a full rear LED Scuding conversion the it looked even worse against the newer wiring. Furthermore the water protection boots needed replacing too on the wires to prevent ingress of water.

Let's show pics first and then I'll supply links later for sources of parts to repair. This is a tiny fraction of cost of new looms.

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Keywords for buying parts on places like aliexpress or ebay

Amp superseal
Amp superseal rubber

Inexpensive to buy and replacing cracked seals will improve reliability greatly. You can either buy the pin extraction tool or use a pin as shown..

 

Just to give you some idea... This tiny original loom to buy is over $500 new. A bit silly considering how simple it is.

Parts just a few dollars and some patience.

 

Thanks Dan. Really pleased with results and it worked first time. Did continuity checks with multimeter first ofcourse.

 

Yes, Ferrari prices can be all over the shop...

Typically this happens when they are holding stock from a while ago. The way I think their model works is that initial parts prices when the car is close to being new are actually not so bad. As stock is exhausted and they have to go back to manufacturers to order more, they have a minimum quantity to they need to order and ofcourse that order is much lower than the large quantities required during manufacture of the vehicles themselves, so at this point the supplier is charging more (and also due to inflation since the last batch sold which could be measured in years) and ofcourse quantity is much lower so volume discounts are less, plus they use some sort of multiplier to increase prices as the cars get older. Yes parts prices are weighted to go up (!) as the cars get older. For common failure parts the prices could stay relatively constant (inflation adjusted) due to the volumes requested and satisfying their profit margins but for parts that are in stock and not sold often the prices can be much cheaper!

If my rear light harness would have been just $21 dollars I simply would have just bought them new, at $500 a pop it made little sense to me to pay it especially considering how simple they are. I was even considering calculating the AWG of the wire required (as now I'm using LED the power consumption is a fraction of the original demand). Thus allowing much lighter spec wiring to be fitted and replacing the looms for all the indicators with thinner wires but in the end the weight saving would have been minimal for the time and effort invested.

 

https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.com%2Fulk%2Fitm%2F292666266088

Search amp superseal rubber on ebay..

4 way means 4 pin,
2 way means 2 pin, etc.

 

Genuine ones are a bit more expensive. Still dramatically cheaper than a new loom.

You can buy them from rs

https://uk.rs-online.com/mobile/p/automotive-connector-accessories/3662077/