Alternator/Battery Cable.....

Railroad · 20-08-2008, 21:23

I've noticed on my Octavia TDi that the alternator cable on top of the battery, and right next to the 110A fusible link gets very hot when the headlamps, heated screen and fan blower are all on. The cable has also discoloured due to the heat and resistance, and I've measured a volt drop of 0.8V under load between the cable and the terminal where it crimps. I've seen this before on other VW/Audi models and Ford Galaxy vehicles, so I'd say it's relatively common.

I want to renew the cable, but rather than make one does anyone know if the individual cable is available to buy, or is it part of the complete loom?

Thanks in advance.....

Lummox · 20-08-2008, 21:38

Yep you can get the cable on its own.

Railroad · 20-08-2008, 21:43

Quote:

Originally Posted by Lummox

Yep you can get the cable on its own.

Does it run from the 110A fuse directly to the alternator or to the starter motor?......

Lummox · 20-08-2008, 21:46

Direct to the alternator. The starter motor wire goes direct to the battery terminal.

Railroad · 20-08-2008, 21:47

Quote:

Originally Posted by Lummox

Direct to the alternator. The starter motor wire goes direct to the battery terminal.

Great, thanks for that. I'll order one tomorrow.......

AcW · 21-08-2008, 09:04

Check the fuse box, you may find that the fuse is damaged and the fuse box burnt, do it now as the alternator goes if you leave it.

Andy

Railroad · 21-08-2008, 14:13

Quote:

Originally Posted by AcW

Check the fuse box, you may find that the fuse is damaged and the fuse box burnt, do it now as the alternator goes if you leave it.

Andy

Thanks for that, the fuse box is in perfectly good condition and the 110Amp fuse is as clean as a whistle. The problem was a bad connection between the cable and the fuse. It showed signs of being left loose because pitted burn marks were evident. This would've caused a resistance, and therefore a voltage drop could be measured between the alternator and battery.

I've replaced the cable now and the voltage difference between the alternator and battery positive is now around 155mv with all loads on. Charging voltage is now around 14.2V with no load, and 13.6V under full load. The alternator was loaded at 75A with headlamps, heated screen and heater blower on. It's difficult to see how I could get much better than that.....

AcW · 22-08-2008, 08:45

Looks like you got it in time, mine melted the fuse mount then the altenator went, i think i was £300 in total to get it fixed. happy days

cookie-859 · 05-09-2008, 20:54

YOU SEE "AcW "WE AREN'T THE ONLY ONES!!! Geerrrrrrrrrr!!!

20-08-2008, 21:23	#1
Railroad Briskodian Join Date: Aug 2008 Location: Romsey, Hants Posts: 154 Members Car: Skoda Octavia Elegance TDi Thanks: 3 Thanked 16 Times in 15 Posts	Alternator/Battery Cable..... I've noticed on my Octavia TDi that the alternator cable on top of the battery, and right next to the 110A fusible link gets very hot when the headlamps, heated screen and fan blower are all on. The cable has also discoloured due to the heat and resistance, and I've measured a volt drop of 0.8V under load between the cable and the terminal where it crimps. I've seen this before on other VW/Audi models and Ford Galaxy vehicles, so I'd say it's relatively common. I want to renew the cable, but rather than make one does anyone know if the individual cable is available to buy, or is it part of the complete loom? Thanks in advance.....

20-08-2008, 21:38	#2
Lummox Got wood? Join Date: Sep 2003 Location: Newport Pagnell Posts: 24,595 Members Car: The best Fabia vRS Estate Images: 7 Thanks: 56 Thanked 1,160 Times in 923 Posts	Re: Alternator/Battery Cable..... Yep you can get the cable on its own. __________________

20-08-2008, 21:46	#4
Lummox Got wood? Join Date: Sep 2003 Location: Newport Pagnell Posts: 24,595 Members Car: The best Fabia vRS Estate Images: 7 Thanks: 56 Thanked 1,160 Times in 923 Posts	Re: Alternator/Battery Cable..... Direct to the alternator. The starter motor wire goes direct to the battery terminal. __________________

21-08-2008, 09:04	#6
AcW Briskodian Join Date: Aug 2006 Posts: 84 Members Car: Thanks: 0 Thanked 1 Time in 1 Post	Re: Alternator/Battery Cable..... Check the fuse box, you may find that the fuse is damaged and the fuse box burnt, do it now as the alternator goes if you leave it. Andy

22-08-2008, 08:45	#8
AcW Briskodian Join Date: Aug 2006 Posts: 84 Members Car: Thanks: 0 Thanked 1 Time in 1 Post	Re: Alternator/Battery Cable..... Looks like you got it in time, mine melted the fuse mount then the altenator went, i think i was £300 in total to get it fixed. happy days

05-09-2008, 20:54	#9
cookie-859 Briskodian Join Date: Apr 2008 Posts: 22 Members Car: Thanks: 2 Thanked 1 Time in 1 Post	Re: Alternator/Battery Cable..... YOU SEE "AcW "WE AREN'T THE ONLY ONES!!! Geerrrrrrrrrr!!!

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