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Unread 10-27-2009, 10:01 PM   #1
lazyguy
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5.9 cranking slow

I just bought these two J Trucks, '75 and a '76, the ;76 has a 360 and TH400 mated to quadra-trac trans case. I hooked up a known good battery cleaned all battery, starter, and solenoid connections but the engine still cranks slow. I know it probably needs all new batt cables and the one to the starter. Is there anything else that could possibly cause this to happen? I was also wondering if anyone has ignition wiring diagrams for these years. I think i have the BID ignition system and can't find a full proof diagram. The haynes manual i picked up covers too many years and is too generic. Does anyone know what color wire is the supposed resistance wire for the coil when running? The reason i don't mention anything about the '75 is that the whole engine side harness got fried and I have yet to put the new harness in, but hopefully when the '76 runs I'll just use it as an example.

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Unread 10-28-2009, 09:18 AM   #2
CSP
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Both of those J-trucks would have had the Prestolite ignition system from the factory. There is no resistance wire with this ignition system.
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Unread 10-28-2009, 10:09 AM   #3
lazyguy
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What is the prestolite system because I have only read about the BID, SSI, and points systems on j trucks. and all have some sort of resitor wire.
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Unread 10-28-2009, 12:20 PM   #4
jeepdaddy2000
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Clean all connections, replace cables, insure solenoid is operating properly. Might check the starter brushes as well. The Ford style starters are notorious for eating them down, causing slow cranking.
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Unread 10-28-2009, 11:15 PM   #5
lazyguy
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Originally Posted by jeepdaddy2000 View Post
Clean all connections, replace cables, insure solenoid is operating properly. Might check the starter brushes as well. The Ford style starters are notorious for eating them down, causing slow cranking.
The current starter is old but new, it was new about a year ago but was never really used and just sat bolted to the engine.
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Unread 10-28-2009, 11:30 PM   #6
lazyguy
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here is the truck in question.
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Unread 10-29-2009, 10:53 AM   #7
lazyguy
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Quote:
Originally Posted by CSP View Post
Both of those J-trucks would have had the Prestolite ignition system from the factory. There is no resistance wire with this ignition system.
I have looked at new igniton coils for this year and it says right on the coil, use with an external resitor. I am confused.
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Unread 10-29-2009, 11:04 AM   #8
Pathkiller
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Will it start and run? Check the timing. Too much timing advance will cause a hard start condition.
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Unread 10-29-2009, 05:08 PM   #9
lazyguy
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Will it start and run? Check the timing. Too much timing advance will cause a hard start condition.
Has spark and fuel it just cranks way to slow to ignite and run.
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Unread 10-30-2009, 11:27 AM   #10
CSP
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Regardless of what generic, replacement coils say there is no resistor wire with the Prestolite ignition system.

Even if it did, that would have nothing to do with your slow cranking starter.

Saying it has spark and fuel doesn't answer the question about timing. You need to check it.
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Unread 10-30-2009, 09:26 PM   #11
lazyguy
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Originally Posted by CSP View Post
Regardless of what generic, replacement coils say there is no resistor wire with the Prestolite ignition system.

Even if it did, that would have nothing to do with your slow cranking starter.

Saying it has spark and fuel doesn't answer the question about timing. You need to check it.
in the course of trying to get it to turn over faster i removed all the spark plugs from one side and it made a little difference in the crank speed. I will check the timing just to make sure. What is a ballpark timing reading for this engine?
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Unread 11-02-2009, 08:45 AM   #12
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It turned over faster because you removed the element of compression in the cylinders.
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Unread 11-02-2009, 02:28 PM   #13
lazyguy
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Will I get a timing reading even thought is turns so slow?
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Unread 11-09-2009, 11:10 AM   #14
Pathkiller
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Will I get a timing reading even thought is turns so slow?
No, but you should be able to set it to TDC and get it to run good enough to use a timing light on.
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Unread 11-10-2009, 01:58 PM   #15
lazyguy
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Good news, I ran a dedicated 4ga ground cable from the starter mounting bolt to the battery ground and what a major improvement it made. Now I just have to put the battery ground to the block instead of where the old owner had it, bolted to the A/C bracket. It still didn't start but its getting there.
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