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#1 |
Registered User
Join Date: Sep 2015
Location: Denton,TX
Posts: 10
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Engine Starter Engaging When Key Turns to ACC or ON!!
I have a 71 C10, HEI, Powermaster Performance starter. I’m having some electrical issues. My engine is now starting anytime I turn the key either to ON or ACC. if I turn it all the way to START it just grinds badly. Starter is aligned well w/proper gapping and engages/disengages properly. The only way I can start and drive is to pull the brown ACC wire from the back of the ignition switch.
Any help would be appreciated. I feel I’m pull rope from both ends rather than figuring out the simplest ways to find the root cause. Seems like possibly a grounding issue that’s causing a loop but not sure how to find it. Any help, suggestions would be greatly appreciated. Lemme know if you need more specs or images. Posted via Mobile Device Last edited by begNOpardon; 09-04-2021 at 05:42 PM. |
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#2 |
Senior Member
![]() Join Date: Apr 2016
Location: Cypress, TX
Posts: 3,704
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Re: Engine Starter Engaging When Key Turns to ACC or ON!!
Make sure you only have the purple wire going to the start post on the starter, and don't have other wires such as yellow going to that same post. My 2 cents.
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#3 |
Registered User
Join Date: Sep 2015
Location: Denton,TX
Posts: 10
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#4 |
Senior Member
![]() Join Date: Dec 2009
Location: TN.
Posts: 8,098
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Re: Engine Starter Engaging When Key Turns to ACC or ON!!
Pictures would help us help you.
Is the harness pinched between Transmission and engine? How old is the Ignition switch? ,.....////
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________________________________________________________________________________________ ____________________________________________ 84 Chevy K-20 63 Impala (my high school car) http://67-72chevytrucks.com/vboard/s...Crew Cab Build |
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#5 |
Senior Member
![]() Join Date: Apr 2016
Location: Cypress, TX
Posts: 3,704
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Re: Engine Starter Engaging When Key Turns to ACC or ON!!
I re-read your first post. So with the engine not running, when you turn the key one click to the right the starter starts turning the engine over? You mentioned when you turn the key all the way to start it grinds, does that mean there is a difference between the engine turning over with key in on position, and you get additional sound of grinding adding to that with the key in start position?
I suggest take the purple wire off the starter and connect it to a test light or voltmeter. Connect the negative lead of the voltmeter or test light to ground. See what the test light does in various key positions. Trace the purple wire back from the starter and check the condition of it and make sure it's not connected to anything else and that the insulation is in good condition. You may need to unwrap the wiring harness to do that, and you can re-wrap it with the same tape or buy new non-adhesive vinyl tape. It should go through a neutral safety switch, which makes sure the truck is in neutral or park when starting, and then to the ignition switch. There should be no other wires connected to the purple wire at the neutral safety switch or at the ignition switch. I don't think the problem is likely to be related to ground in any way. You can remove the connector from the ignition switch and test it with an ohm meter or test light, to make sure the tang that supplies the purple wire voltage only gives voltage in the start position. It should conduct from the tang the fat red wire connects to, to the tang the purple wire connects to, only in the start position. Picture is from a post by VetteVet |
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#6 |
Senior Member
![]() Join Date: Oct 2013
Location: Garden City, GA
Posts: 295
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Re: Engine Starter Engaging When Key Turns to ACC or ON!!
Take the harness connector off and look for signs of excessive heat and melting of the plastic. If it is melted, the switch itself may be damaged.
That's all I got.
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They tell me that I have Bipolar disorder. That doesn't really bother me. 30 minutes from now it might, but not right now. |
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#7 |
Senior Member
![]() Join Date: Dec 2009
Location: TN.
Posts: 8,098
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Re: Engine Starter Engaging When Key Turns to ACC or ON!!
Auto or Manuel Transmission?
,....////
__________________
________________________________________________________________________________________ ____________________________________________ 84 Chevy K-20 63 Impala (my high school car) http://67-72chevytrucks.com/vboard/s...Crew Cab Build |
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#8 |
Registered User
Join Date: Oct 2005
Location: Overland Park, Ks.
Posts: 5,216
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Re: Engine Starter Engaging When Key Turns to ACC or ON!!
I just had the same thing happen to mine. I had to replace the ign. switch & put a new pigtail on the connector. It is fine now.
George |
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#9 | |
Registered User
Join Date: Oct 2009
Location: Denton, Texas
Posts: 1,713
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Re: Engine Starter Engaging When Key Turns to ACC or ON!!
Quote:
By the way, I'm also in Denton, Texas. O'reillies auto parts carries ignition switches for our truck in stock. I usually have a spare on hand just in case. |
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#10 |
Registered User
![]() Join Date: Aug 2019
Location: Cheraw
Posts: 1,305
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Re: Engine Starter Engaging When Key Turns to ACC or ON!!
With your foot on the brake, take the truck out of park and put it in any gear. Now turn the key on. If nothing happens you have a bad ignition switch.
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#11 |
All about them K’s
![]() Join Date: Jun 2014
Location: Land of Entrapment
Posts: 6,374
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Re: Engine Starter Engaging When Key Turns to ACC or ON!!
You can test the switch with a multi meter/ohm meter as well. You just have to pull the switch and the plug and test for continuity from the power feed tang on the switch to the purple wire tang in the different positions of the key. It should only have continuity with the key in the start position.
I went thru this with my ‘57 and a new aftermarket switch a few years back. Switch tested bad, and was replaced.
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Tyler '57 3100 http://67-72chevytrucks.com/vboard/s...d.php?t=813888 '72 K20 Cheyenne http://67-72chevytrucks.com/vboard/s...d.php?t=662879 ‘69 K10 SWB http://67-72chevytrucks.com/vboard/s...d.php?t=805206 '98 Silverado LT K2500HD ECLB Vortec 454/4l80E: 6" lift 315/75/16's ‘87 IROC-Z all original 50K mile survivor TPI 305 IROC Blue ‘10 Camaro 2SS/RS Aqua Blue Metallic #93 -version 2.0 ![]() Last edited by 57taskforce; 09-05-2021 at 10:09 AM. |
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#12 | |
Registered User
Join Date: Sep 2015
Location: Denton,TX
Posts: 10
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Quote:
Starter is now GOOD! Thanks! However on the wiring diagram the purple ignition wire heads straight to the firewall and then there is another purple/white wire that goes to the neutral safety switch. My ignition/truck does not have the purple/white, only a solid purple. Can that purple be ran directly through the neutral switch or do I need to add a wire (purple/white) from ignition to switch to firewall? Posted via Mobile Device |
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#13 | |
Registered User
Join Date: Sep 2015
Location: Denton,TX
Posts: 10
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Quote:
Posted via Mobile Device |
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#14 | |
Registered User
Join Date: Sep 2015
Location: Denton,TX
Posts: 10
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Quote:
Awesome you’re in Denton. See previous replies though, ignition is brand new. Problem half solved. Starter working as should but now dealing with no running lights/brake lights. Posted via Mobile Device |
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#15 | |
All about them K’s
![]() Join Date: Jun 2014
Location: Land of Entrapment
Posts: 6,374
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Re: Engine Starter Engaging When Key Turns to ACC or ON!!
Quote:
__________________
Tyler '57 3100 http://67-72chevytrucks.com/vboard/s...d.php?t=813888 '72 K20 Cheyenne http://67-72chevytrucks.com/vboard/s...d.php?t=662879 ‘69 K10 SWB http://67-72chevytrucks.com/vboard/s...d.php?t=805206 '98 Silverado LT K2500HD ECLB Vortec 454/4l80E: 6" lift 315/75/16's ‘87 IROC-Z all original 50K mile survivor TPI 305 IROC Blue ‘10 Camaro 2SS/RS Aqua Blue Metallic #93 -version 2.0 ![]() |
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#16 |
Senior Member
![]() ![]() Join Date: Jan 2005
Location: CA
Posts: 5,480
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Re: Engine Starter Engaging When Key Turns to ACC or ON!!
The dashed purple wire on the schematic isn't a separate wire. It is showing alternate wiring for a neutral safety switch inside the cab for an automatic transmission. You can just route your existing purple wire through your neutral safety switch.
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#17 | |
Registered User
Join Date: Sep 2015
Location: Denton,TX
Posts: 10
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Quote:
I’ll reach out if I hit a wall. Posted via Mobile Device |
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#18 | |
Registered User
Join Date: Sep 2015
Location: Denton,TX
Posts: 10
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Quote:
Posted via Mobile Device |
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#19 |
Registered User
![]() Join Date: May 2005
Location: Tallahassee Fl
Posts: 773
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Re: Engine Starter Engaging When Key Turns to ACC or ON!!
Had this happen, Housing was cracked on Neutral Safety Switch. Even more fun was the entire steering column being charged.
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#20 |
Registered User
![]() Join Date: Aug 2019
Location: Cheraw
Posts: 1,305
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Re: Engine Starter Engaging When Key Turns to ACC or ON!!
I am looking at pgs 8-32,8-33 and 8-34 in the 10-30 service manual. The ppl 12 ga wire goes from the ign switch to the neutral safety switch, thru the switch, thru the bulk head connector to the starter. It doesn't change color. It stays ppl all the way to the starter.
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