 Need fuse help |
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| Porsche Rescue |
 Feb 27 2003, 10:34 PM
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#1
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Saving and Enjoying Old Porsches  Group: Members Posts: 2,978 Joined: 31-December 02 From: Bend, Oregon Member No.: 64 Region Association: None  |
What do the two fuses on the relay/regulator board in the engine compartment protect? I thought one was for the heated rear window (which I don't have but there are two 25 amp fuses) and one for the fuel pump. When I operate my heater fan I blow the fuel pump fuse. Does the same fuse protect the pump and the fan, or is the heater circuit somehow shorting to the fuel pump circuit?
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Replies(1 - 8)
| SirAndy |
Feb 27 2003, 11:21 PM
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#2
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Resident German Group: Admin Posts: 41,682 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
QUOTE(jim9146 @ Feb 27 2003, 08:34 PM) What do the two fuses on the relay/regulator board in the engine compartment protect? I thought one was for the heated rear window (which I don't have but there are two 25 amp fuses) and one for the fuel pump. When I operate my heater fan I blow the fuel pump fuse. Does the same fuse protect the pump and the fan, or is the heater circuit somehow shorting to the fuel pump circuit? the first fuse (the one towards the front of the car) is 8amp. according to my wire-diagram, it does not seem to be used ... the second fuse (the one towards the rear of the car) is 25amp. it is for: 1) Rear Window Heater relay 2) Gasoline Pump Relay 3) Heater Blower Relay where 1) is the relay right below the fuse, then comes the relay for the Power Supply, then 2) the relay for the gasoline pump, then 3) the relay for the heater blower the right cable for the heater blower comes off pin 11 on the second connector plug (the one towards the rear of the car). it is supposed to be a green wire. 1 - 2 3 - 4 5 - 6 7 - 9 - 10 11 - 12 1 = green/red = oil pressure switch 2 = gray/brown = ??? 3 = green/black = oil temperatur indicator 4 = gray/brown = ??? 5 = black/pink = ignition coil 6 = yellow = starter 7 = black/red = ignition coil 8 9 = ??? (connected to fuse 1, 8amp) 10 = ??? (connected to sportomatic) 11 = green = heater blower 12 = white = supplementary air valve hope that helps, Andy (IMG:style_emoticons/default/aktion035.gif) |
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| Brad Roberts |
Feb 27 2003, 11:37 PM
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#3
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914 Freak! Group: Members Posts: 19,148 Joined: 23-December 02 Member No.: 8 Region Association: None |
I had a 914 that would die when I turned on the Heater blower. The contacts for the fuse where corroaded (as well as the fuse) It would run out of gas.
B |
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| Curvie Roadlover |
Feb 28 2003, 06:10 AM
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#4
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Two trunks are better than one! Group: Members Posts: 2,025 Joined: 29-December 02 From: Southeast Michigan Member No.: 42 |
Reminds me of my breakdown in Foster City. Remember, Brad? I thought, Holy Shit, I've got 3000 miles to go and I didn't even make it out of the neighborhood. Thanks for your relay board fuse rescue. That was when I put your number on vioce dial. HAHA (IMG:style_emoticons/default/pray.gif) (IMG:style_emoticons/default/cool_shades.gif)
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| Porsche Rescue |
Feb 28 2003, 10:19 AM
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#5
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Saving and Enjoying Old Porsches Group: Members Posts: 2,978 Joined: 31-December 02 From: Bend, Oregon Member No.: 64 Region Association: None |
Thanks Andy. Now all I have to do is find out what's wrong with my heater blower. Fortunately, I discovered the problem in the garage, not on the road. Guess I know why the PO had disconnected the heater fan!
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| Dave_Darling |
Feb 28 2003, 10:47 AM
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#6
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914 Idiot Group: Members Posts: 14,991 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California 
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Jim, what year is your car? The exact wiring that hooks up to the relay board changed from year to year...
See the Haynes manual for wiring diagrams. They are also available on Pelican's site, or possibly in a downloadable form from somewhere or another. --DD |
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| SirAndy |
Feb 28 2003, 12:34 PM
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#7
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Resident German Group: Admin Posts: 41,682 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
QUOTE(Dave_Darling @ Feb 28 2003, 08:47 AM) Jim, what year is your car? The exact wiring that hooks up to the relay board changed from year to year... his name indicates a /6 so i assumed he has a early car ... yes, dave is correct, layout changes (slightly) for later models. Andy |
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| Porsche Rescue |
Feb 28 2003, 12:51 PM
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#8
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Saving and Enjoying Old Porsches Group: Members Posts: 2,978 Joined: 31-December 02 From: Bend, Oregon Member No.: 64 Region Association: None |
Car with the problem is a '70-4. It's the signal orange "upper" one in my avatar. I am getting it ready to sell ( I have 2 914's too many). I also have a '70-6, but heater fan is not an issue since there is none--headers. Thanks again.
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| SirAndy |
Feb 28 2003, 12:56 PM
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#9
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Resident German Group: Admin Posts: 41,682 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
QUOTE(jim9146 @ Feb 28 2003, 10:51 AM) Car with the problem is a '70-4. It's the signal orange "upper" one in my avatar. I am getting it ready to sell ( I have 2 914's too many). I also have a '70-6, but heater fan is not an issue since there is none--headers. Thanks again. 70 is perfect! i got the above info from a 70/71 diagram .... Andy |
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