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Old 09-17-2007, 03:35 PM   #15
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1974 31' Sovereign
1993 21' Sovereign
Colfax , North Carolina
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The reasoning behind this is so that the wire is not energized unless you actually use the charge line. Of course, I wouldn't know why I'd order a vehicle with a tow package unless I planned to tow something, but what do I know?

Meddle not in the affairs of dragons, for you are crunchy, and taste good with ketchup.
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Old 09-17-2007, 06:31 PM   #16
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I had to provide the missing fuse also. It makes me think that some lawyer-type had a hand in this. That said, there ain't no logic to it!!!


2003 GMC 3500 D/A, CC, LB, 4x4 and 2000 Airstream Excella 30. WBCCI 7074
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Old 09-17-2007, 07:10 PM   #17
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2006 25' Safari FB SE
St. Cloud , Minnesota
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In the glove compartment of my '06 GMC were the bare end wires with the plug that fit the under dash socket for the brake controller. The fuse was taped to the wire bundle in the glove kitty. I got the proper answer from my dealer's Duramax/Allison mechanic the first time I asked. GM is 'right on' if you get the right person.

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Old 09-17-2007, 08:28 PM   #18
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Eureka , California
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Yeah, it's getting the right person... I went to the dealership today asking them to clarify whether I needed a fuse. The manual says, single batteries and diesels= yes/ dual batteries (TP2) = No.

I have a diesel with two batteries- so which is it? The service counter person tells me NO- I have two batteries. I reiterate BUT it's a diesel. After some confusion she tells me to make an appointment to diagnose the situation(manuals are too ambiguous to be specific to my vehicle- duh and huh?).

Luckily a mechanic was listening in (and asked the right person in a hurry) and stopped me to say- look in your glove box and there is a list of codes... see if TP2 is listed, if not then you need the fuse - dual battery or not.

Guess what- I needed the fuse, as my voltmeter was telling me. All this time I have had issue after issue and it could all have been this fuse!!


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