Any bright ideas? Please help!
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New User
Joined: Mar 2009
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Any bright ideas? Please help!
I just bought a 79 Bronco XL Ranger 6.6L as a mud truck because it doesnt have a title. I went to the guys house and he cranked it right up. I bought it, and he took the battery out after we got it on my trailer. When I got it home, i put in a new battery in it, and it was cranking but not sparking. I realized the last owner had the cables mixed up. He had the red (normally posotive wire) on the neg and the black wire on the positive. The red wire grounds out on the engine block so it must be negative right? But i didnt realize that at first. So i chaned the coil and the starter cylinoid and switched the cables back but now it wont even crank when i turn the key! any sugestions?
Junior User
Joined: Feb 2009
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i have a 79 also the cables have to be super clean and very tight to get good conection also make sure the ground is clean and tight at the motor u should have a second ground from firewall to back of intake there also bad on starter solenoids try tapping on it or u can jump it with a screw driver from the starter wire to the small terminal beside the cable that goes to the battery c what happens let me know
if u get it to crank but still no fire there also bad for the duraspark box going bad when im wheelin i always have a spare with me
if u get it to crank but still no fire there also bad for the duraspark box going bad when im wheelin i always have a spare with me
Cargo Master
Joined: Mar 2006
Posts: 2,789
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From: Sand GAp, KY
It is a negative ground. When you had the cables hooked up in reverse you may have fried the duraspark box and some other electrical components. You should always check where the cables go before hooking them up if you did not do the origanal install. I know that I have at times had two black or two red cables or even had them reversed as yours are because it was all I had at the time.
Elder User
Joined: Feb 2007
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From: Nikiski Alaska
It sounds as if it will not turnover you may have fried the solenoid. Have you tried to bypass it as big bad 79 said. also you may have welded the bendix in the starter with the reversed polarity.
Lead Driver
Joined: Sep 2002
Posts: 9,182
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From: Gateway to the West
Reversing the solenoid coil will sometimes fry it but unless it was engaged for a sustained amount of time and overheated its unlikely. The Duraspark modules go bad if you look at them wrong. Supply their early micro-electronic technology with inverted voltage and you will disrupt it's "thought process" for good. The one thing to be very certain of is year, engine and model as these modules were extremely vehicle specific. Take big bad 79's advice... carry a spare.
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thank you very much. I replaced the duraspark and the starter sylenoid and the coil, but now it wont even turn over when i crank it. I bypassed the ignition by using plyers on the sylenoid to make it crank, and i ran a direct positve wire from the battery to the coil, but im still not getting a spark.
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Lead Driver
Joined: Sep 2002
Posts: 9,182
Likes: 12
From: Gateway to the West
If a direct line is not giving you spark, you are dealing with a battery issue... inversion can sometimes kill the cell in the battery that was attempting to send a charge at the time of the initial short. You may do well to have the battery tested to be sure it hasn't managed to have a cell go south.
Elder User
Joined: Feb 2007
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From: Nikiski Alaska
What we need to know is if it is turning over and not sparking, or if it does not turn the motor at all. if the motor is turning and not sparking i would check the reluctor ring(the pick up) in the distributor if you have replaced the box and such with no improvement.
New User
Joined: Mar 2009
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On a 79 when you replaced the Duraspark I still worry you fried the coil. If you have a Chiltons or Haynes then check the resistance of the coil versus what is stated in the manual. Also on a 79 there is a fusable link that moves toward a distribution center, not like the boxes on the newer Broncos but you can track them off the solenoid and they are easily tested.
