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6.5L Diesel Engine Discuss the 6.5 GM diesel engine & associated components. Automatic transmission questions & problems belong in the 4L80/85 - 4L60E - 6L90 Transmission Forum

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Old 01-23-2020, 05:24 PM   #1 (permalink)
grep
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test for good battery cable connection

95' Suburban 4x4 with 6.5TD. 211k miles
Question 1:
Here lately the starter cranks over slower than it used to resulting in harder starting. When I jump it from a running vehicle, starter turns fast like normal and engine starts right up quick. Batteries in it were old so I put two new batteries in, starter still turns somewhat slow, not as fast as it should. Replaced the long cable that links the two +Positive terminals together, starter still turns slower than it should. How do I test my other battery cables to see how well they are connecting ?. There is no oxidation on the terminals, the terminals are clean tight. Both batteries ground to the engine, those bolts are clean and tight. Alternator is keeping batteries charged.

Question 2:
Is it OK to pump the "gas" pedal several times before cranking, that seems to help get it started quicker if I don't have a jump vehicle.

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95 GMC Sub 4x4 - K1500 - 6.5TD Got it in Dec 2007 - Replaced so far ( as of June 2016 ): PMD x2 - OPS x2 - Vac pump & solenoid valve - belt tensioner - harmonic balancer pulley x2 - AC compressor - U-Joints- All 4 interior door handles - Driver Door window motor - Transmission Rebuilt 4/2016

My other wheels:
2003 Honda VTX 1800R-3
1984 F150 SC one owner

Last edited by grep; 01-23-2020 at 05:27 PM.
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Old 01-23-2020, 06:10 PM   #2 (permalink)
Sirleitet
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It's either one of these causes: your major ground cables are broken or missing, or the starter motor is bad.
Mine behaved like yours a while ago when I replaced the batteries, and it was still cranking slow. Replaced the starter with AC delco and it spins super fast now.

Edit. Question 2: Yes, it's fine. You have a electronic IP so it will regulate how much fuels goes into the engine at a given time.

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1995 Chevrolet Cheyenne K2500 6.5TD / Suzuki Katana GS650G
Mods: Racor 690r fuel filter/w heater, new front face, new radiator and support bushings. Repaired both cab corners & frame. (Rust.)
Relocated PMD, DIY extended wiring harness. # of PMD replaced since owned truck in 2013: 5.

Last edited by Sirleitet; 01-23-2020 at 06:12 PM.
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Old 01-23-2020, 06:52 PM   #3 (permalink)
grep
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Quote:
Originally Posted by Sirleitet View Post
It's either one of these causes: your major ground cables are broken or missing, or the starter motor is bad.
Mine behaved like yours a while ago when I replaced the batteries, and it was still cranking slow. Replaced the starter with AC delco and it spins super fast now.

Edit. Question 2: Yes, it's fine. You have a electronic IP so it will regulate how much fuels goes into the engine at a given time.
Each battery - negative terminal is grounded to engine, left battery grounds to top of engine on left side, right battery grounds to top of engine on right side. Is there supposed to be another ground besides those ? I should be able to ground each negative terminal to clean area on frame or engine with jumper cables to test that.

When you Jumped started did your starter spin faster ? NAPA starters are running about $200, pretty steep for a test, but with 211k miles on the original starter it would be time for it to get weak.
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95 GMC Sub 4x4 - K1500 - 6.5TD Got it in Dec 2007 - Replaced so far ( as of June 2016 ): PMD x2 - OPS x2 - Vac pump & solenoid valve - belt tensioner - harmonic balancer pulley x2 - AC compressor - U-Joints- All 4 interior door handles - Driver Door window motor - Transmission Rebuilt 4/2016

My other wheels:
2003 Honda VTX 1800R-3
1984 F150 SC one owner
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Old 01-23-2020, 07:07 PM   #4 (permalink)
heymccall
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Connect voltmeter to battery positive, crank with fuel off. Record voltage.
Connect voltmeter to starter positive, crank with fuel off.
Compare voltage.
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Old 01-23-2020, 07:47 PM   #5 (permalink)
Sirleitet
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Here you go grep: https://www.dieselplace.com/forum/63...d-grounds.html


I suggest doing what heymccall wrote, it will tell you a lot about the electrical system.
But keep in mind it won't show obvious damage like a magnet plate or two has detached inside the starter motor.
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1995 Chevrolet Cheyenne K2500 6.5TD / Suzuki Katana GS650G
Mods: Racor 690r fuel filter/w heater, new front face, new radiator and support bushings. Repaired both cab corners & frame. (Rust.)
Relocated PMD, DIY extended wiring harness. # of PMD replaced since owned truck in 2013: 5.
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Old 01-29-2020, 12:49 AM   #6 (permalink)
bk95td
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The OE cables are over 20 years old. They were marginal size when they were new and the terminals on them were pretty crappy.
You won't believe the difference that a set of custom 2-0 cables can make. Here is my thread about making a set: https://www.dieselplace.com/forum/63...-93-6-5-a.html
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91 K2500LD reg cab 6.2 4L60 deceased at 310k
92 k2500hd 6.5 4L80E std cab died of frame cancer285 k
4- 93 k2500hd 6.5 2-4L80E 2-NV4500 2-ex-cab 2 std
94 K2500HD 6.5td 4L80E new reman engine
94 K2500HD 6.5td NV4500 Std cab LB
2-94 K1500 Ex cab 6.5TD 4L80E 1-LB parts truck 1-SB
94 k25000 Suburban 6.5td 4l80E
95 tahoe 2 dr 6.5 4L80E needs HG or engine
95 k2500LD 6.5 4L80E std cab bad trans
95 k2500hd 6.5 4L80E ex-cab
2-95 K2500 Suburban 6.5TD 4L80E both need engines
97 k2500hd 6.5 4L80E std cab
97 k3500 C&C 6.5 4L80E std cab needs engine
98 k2500 hd 6.5 4L80E std cab bad trans
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