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5-Series (E12,E28, E34, E39, E60) Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)

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Old 10-22-2010, 02:15 PM   #1 (permalink)
RIL
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40 amp extra load - Power from where? (E39)

I'm about to add an extra electric device consuming some 40 A battery power continously. I'm placing the device in the front under the hood. The device will be relayed to ON on starting the engine. For this I have two questions:

1. Is there an existing preferred cable already in place which I could attach to (powering the 40 A relayed device), or will I have to add an extra 6 mm cable all the way from the battery in the back of the car to the front?

2. In order to control the 40A relay for the above device, it suffice if the extra device kicks in AFTER the engine is running fine (that is, avoiding extra load while the starter is working hard). Where from should I best pick up the 12V signal to the above 40A relay?

I'm not an expert on BMW so I would need helpt to locate any existing connection points.

I opened the Control Unit Box under the hood (to the right, near the front window) and I can there see a fairly "fat" realyed red cable, but I have no instructions /wire diagram available as to determine it's usage.

Regards from Sweden,

// RIL
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Old 10-23-2010, 06:55 PM   #2 (permalink)
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There is an auxiliary positive terminal in the engine compartment of my 2002
540 for "jump" starting the engine. You could get your power there.

I don't have an answer for your second question.
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