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70 Roadrunner starter #1784049 03/19/15 11:20 PM 03/19/15 11:20 PM
Joined: Dec 2014 Posts: 21 New Jersey M mikerrch OP member
mikerrch OP member M Joined: Dec 2014 Posts: 21 New Jersey	I have a 70 roadrunner that won"t crank, new starter, good battery,good relay, have power at large starter post,have power at large relay post,when key is turned relay closes and sends power to starter a loud clack is heard but starter does not turn engine. Engine is not seized. At a total loss,any thoughts would be appreciated.Thanks

Re: 70 Roadrunner starter [Re: mikerrch] #1784050 03/20/15 12:36 AM 03/20/15 12:36 AM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	(1) clamp the small/large starter terminals together with a red jumper cable (be carefull of getting close to the starter case as it will vibrate when it cranks) and clamp the other black jumper cable to the nearby starter ear to ground it (2) set battery on ground by the LF tire (3) clamp the black cable end to batt neg post and red cable end to batt neg post (4) post what happens live every 24 hour block of time like it's your last day on earth

Re: 70 Roadrunner starter [Re: RapidRobert] #1784051 03/20/15 08:36 AM 03/20/15 08:36 AM
Joined: Dec 2014 Posts: 21 New Jersey M mikerrch OP member
mikerrch OP member M Joined: Dec 2014 Posts: 21 New Jersey	did pull starter from car and bench tested as you said,bendix extended and starter spun.still at a loss.Thanks for the response.

Re: 70 Roadrunner starter [Re: mikerrch] #1784052 03/20/15 09:15 AM 03/20/15 09:15 AM
Joined: Aug 2003 Posts: 279 Northeastern PA F Fanning enthusiast
Fanning enthusiast F Joined: Aug 2003 Posts: 279 Northeastern PA	Quote: did pull starter from car and bench tested as you said,bendix extended and starter spun.still at a loss.Thanks for the response. Check to see if you have good clean grounds. From your description it sounds like there is not enough amperage passing thru the cables to the starter, which would indicate a poor or dirty connection.

Re: 70 Roadrunner starter [Re: mikerrch] #1784053 03/20/15 12:18 PM 03/20/15 12:18 PM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	Quote: did pull starter from car and bench tested as you said,bendix extended and starter spun. Bench testing of the starter was OK but is it recieving enough juice when installed? & I would loosen the starter slightly & move it slightly & have a helper in the drivers seat work the key (safety first of course) & see what happens. We know the starter is good/we know the eng ain't locked up (iirc)/what is left is either not enough juice to starter (bad connections/terminals or inadequate battery & we eliminated the batt) or ground path (as mentioned) or there is a binding of some sort in how the starter is aligned to the block/flywheel teeth/mismatch there somehow but I'm thinking more electrical. Stay on it & keep us updated live every 24 hour block of time like it's your last day on earth

Re: 70 Roadrunner starter [Re: RapidRobert] #1784054 03/22/15 11:28 PM 03/22/15 11:28 PM
Joined: Dec 2014 Posts: 21 New Jersey M mikerrch OP member
mikerrch OP member M Joined: Dec 2014 Posts: 21 New Jersey	Found problem, hard to believe the positive cable to starter was dropping out with load applied, brand new cable from E body restorations put old cable on cranked right over UNBELIEVABLE. thanks for all the responses

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