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We've had a 928 fire, and here's what we learned...

 
Old 02-20-2019, 05:48 PM
  #16  
Carl Fausett
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Oh Boy! We know from experience that insulation isn't as abrasion-resistant or flexible (prone to cracking now) than it used to be.
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Old 02-20-2019, 05:53 PM
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Can you please highlight the area of concern.

I'm glad nobody was hurt and damage to a minimum, could have been much worse!!

Originally Posted by Jason89s4 View Post
Wow. I just checked mine, and the way the positive battery cable is routed at that location it looks "designed" to literally rub up against the edge of that mount for the connector, until it saws through the insulation!
You can even see in the pic where the paint has rubbed off!


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Old 02-20-2019, 05:54 PM
  #18  
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Disconnected and pulled back the positive cable from the previous post pics.
Sure enough, that light pink area is where the insulation was up against the bracket and it is starting to rub off!
Knowing what I do of the history of my car...my educated guess is that right now is the first time that cable has been disconnected and pulled back like that.
(You now have Exhibits 1,2 and 3 for your insurance.)


Last edited by Jason89s4; 02-20-2019 at 05:55 PM. Reason: edit
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Old 02-20-2019, 05:57 PM
  #19  
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Great product! I just put it on my wish list for combined shipping with some other parts.
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Old 02-20-2019, 06:03 PM
  #20  
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I made 20 kits. I just let out PO's to make another 20 right away.
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Old 02-20-2019, 06:05 PM
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Where is the pic of where you actually blew it without melting the insulation? Isn't that the point?
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Old 02-20-2019, 06:25 PM
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Damn.

Last edited by rjtw; 02-20-2019 at 11:54 PM.
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Old 02-20-2019, 06:30 PM
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This is my car and the fire was caused by a power steering hose bursting.
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Old 02-20-2019, 06:33 PM
  #24  
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Now to the customer’s 928: we had just finished the work on it that the customer requested, and he was coming the next day to pick it up. I’d taken it for a test drive, all was well, but because it was going to rain, I decided to park it inside for the night.
So if it was just parked for the night why were the fender covers still on it and the car on jack stands - inquiring minds want to know?
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Old 02-20-2019, 06:38 PM
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Good point. Up on jack stands and fender covers don’t look like “for the night”...
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Old 02-20-2019, 06:46 PM
  #26  
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NVM. Must have misread the applicable models.

Last edited by islaTurbine; 02-21-2019 at 11:14 AM.
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Old 02-20-2019, 06:58 PM
  #27  
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Another solution would be to insert a piece of thin rubber material behind the cable there, by adhesive to the inner fender, so that regardless of the wire insulation, at the touch point it is insulated.
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Old 02-20-2019, 07:09 PM
  #28  
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The big red unfused line at the jump post is - from the factory - looped around the harness and connector so as to avoid touching the mounting plate. Or, in other words, not like the pictures above.

Reason #1 to always route things the way the factory did unless you are 100% sure you know better.

When doing a timing belt on ‘87+ and periodically on any 928, it’s important to inspect these unfused lines for damage to the insulation, proper routing and ‘rub’ protection. Two of these at the jump post, ABS power on the other side, starter and alternator. Routing the ABS power correctly after a timing belt is vital. I’ve ‘saved’ several 928s where the ABS line was 1 harness covering molecule away from shorting due to rubbing on the belt cover side, or being cut by the power steering belt.

So: pay attention to that stuff.

On Carl’s original subject: that sucks, glad it only took the car. Owner’s likely not happy. The master fuse looks interesting.
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Old 02-20-2019, 07:13 PM
  #29  
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Linderpat,
Similar thought here. I was thinking put a 1.5 inch piece of silicon heater hose around the cable where it "rubs" up against that bracket.


Once the cover is in place you won't be able to see it.
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Old 02-20-2019, 07:26 PM
  #30  
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Carl, thanks for sharing this experience and the new learnings. Very happy for you that it wasn't worse. I almost completely burned down my new kitchen a few months ago, if it makes your feel any better... This stuff happens.

I know this does not apply to your situation, because the car was in the process of repair and release. For cars however that sit longer periods, I tend to unhook batteries. For the most part, the parasitic drains kill the batteries, and on the other hand, I just don't trust them for months at a time hooked up without being attended to.
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