 Electical Draw ? Lowers RPM ? 914 and 912E, Pull light switch and drops RPMs? |
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| thompson-mfr |
 Dec 17 2013, 02:20 PM
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Thompson, Ryan  Group: Members Posts: 198 Joined: 30-September 08 From: Silverton, OR Member No.: 9,598 Region Association: Pacific Northwest  |
Hi All,
Finally got my car running better 74 914 2L FI. Thanks to all for suggestions. It turns out it was most likely the main power wires loose to my battery (fixed). Fuel was on and off. I noticed something else when setting my idle. When I turn on my headlights my RPM's drop. I recently acquired a 912E and it does the same thing, though not quite as much. I attached some pictures, just because I like threads with pictures better. A. Could this be my Battery? B. Grounds? C. All the above? D. Other_________?    |
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| Mike Bellis |
Dec 17 2013, 05:09 PM
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Resident Electrician Group: Members Posts: 8,345 Joined: 22-June 09 From: Midlothian TX Member No.: 10,496 Region Association: None 
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Most likely your electrical systems (both cars) need some cleaning and freshening. Resistive grounds and corrosion on terminals will increase the amperage of normal loads.
Disconnect all ground terminals, clean and reassemble. Wire brush the fuse panel terminals. Check the alternator wire for lumpyness under the insulation. This will indicate corroded wire. Wire has a life span. It is less than 40 years... (IMG:style_emoticons/default/poke.gif) If you do not know the date of the last time the battery cables were replaced... Replace them. Put in a new ground strap on the tranny. Do all this and the alternator should work better along with the rest of the electrical system. Basically you do an electrical tune up... (IMG:style_emoticons/default/smile.gif) |
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| thompson-mfr |
Dec 17 2013, 06:18 PM
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#3
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Thompson, Ryan Group: Members Posts: 198 Joined: 30-September 08 From: Silverton, OR Member No.: 9,598 Region Association: Pacific Northwest |
QUOTE(Mike Bellis @ Dec 17 2013, 03:09 PM)  Most likely your electrical systems (both cars) need some cleaning and freshening. Resistive grounds and corrosion on terminals will increase the amperage of normal loads. Disconnect all ground terminals, clean and reassemble. Wire brush the fuse panel terminals. Check the alternator wire for lumpyness under the insulation. This will indicate corroded wire. Wire has a life span. It is less than 40 years... (IMG:style_emoticons/default/poke.gif) If you do not know the date of the last time the battery cables were replaced... Replace them. Put in a new ground strap on the tranny. Do all this and the alternator should work better along with the rest of the electrical system. Basically you do an electrical tune up... (IMG:style_emoticons/default/smile.gif) I have replaced the ground on the battery and tranny ground strap. I will clean the grounds and fuse box. Thanks! |
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Posts in this topic
thompson-mfr Electical Draw ? Lowers RPM ? 914 and 912E Dec 17 2013, 02:20 PM
Spoke When you say "RPM drops" do you mean the... Dec 17 2013, 02:42 PM Jon H. The increased load on the alt means that more HP i... Dec 17 2013, 04:33 PM
Drums66
Most likely your electrical systems (both cars) n... Dec 17 2013, 07:37 PM JamesM So, might help to better understand what is actual... Dec 17 2013, 05:17 PM thompson-mfr
So, might help to better understand what is actua... Dec 17 2013, 06:23 PM jim_hoyland Had the same problem. Like Mike says, clean all th... Dec 17 2013, 05:21 PM thompson-mfr
Had the same problem. Like Mike says, clean all t... Dec 17 2013, 06:25 PM jim_hoyland
Had the same problem. Like Mike says, clean all ... Dec 17 2013, 07:22 PM Mike Bellis It's a paradox.
Lower rpm= less charge= lower... Dec 17 2013, 05:24 PM Dave_Darling Brad Anders also found that fine-tuning his idle m... Dec 17 2013, 05:42 PM |
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