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You really do not need 6TL's unless the cable length will not allow for smaller batteries. Any of the larger pick-up truck batteries will work fine. The 6 TL does not have any more cranking amps than a group 27, it does have a ton of reserve power for leaving lights on and for sitting for long...

At one time not long ago the Everstart batteries ( Wal-Mart ) were the top rated batteries. I have always had good service from them. Rick

NEVER run the vehicle with the batteries disconnected! You will be buying a voltage regulator, alternator and probably a lot of other electrical items. Without the batteries to absorb the voltage spikes you can easily put over a hundred volt spike into the system. At which point you will lose...

One dead cell in the battery will do exactly that. Have you checked the acid levels lately? How old are the batteries? If they are more than 4 years old then replace them. Rick

Anything below 23 volts and I doubt you will get much of anything. I would say if you are driving 20 miles then take two good batteries with you. Check the ones in there first like I said, have someone hit the switch while you have a meter on them. What does the voltmeter in the truck say? If...

You need to check the battery voltage while someone hits the switch. If the voltage does not drop there then the relay is bad. 23 volts is still too low and will cause an increase in amperage across the relay. It may not be enough to burn it but do not hold it to long if it does not start. You...

I am not real familiar with this truck but how do you have 23 volts at the starter but only 12 at the relay? Does it not go through the relay to the starter or is it a low currant relay to a second high currant relay on the starter? No matter, a 12 volt drop under load would indicate to me a...