DIY quick connector for Bosch C7 (and C3) car battery charger

The connector has +ve and -ve markings to make it easier.

BHPian vidyanand recently shared this with other enthusiasts.

I needed an extra quick connector to charge my TVS Wego, which has limited use for local errands and would often get discharged by sitting idle. The battery is difficult to reach compared to a car. You need to unscrew 4 bolts to remove a panel and then pull out the battery to access the terminals to clamp. The quick connect harness for Bosch C7 would take care of avoiding this easily.

Although searching with the part did result in Amazon listing but was never available Bosch C75AC0 Quick Connect Cable Harness for C7 Battery Charger with Built-in Cable Fuse. I shot an email to Bosch customer service which was of no help. They redirected to check with the local Bosch Car service centre which never had this product. So eventually decided to go the DIY way as earlier suggested in the thread.

Items needed:

• XT60 connector pair - 1
• Electrical Wire Crimp Terminals Connectors 4-6 sqm (this is the same size as in the C7 charger) - 4
• 1.5 sqm wires - needed length in pair
• Shrink Wrap
• Soldering Kit

I had all items available at home except the connectors. XT60 was ordered on amazon while the battery terminal was sourced from the local electrical shop.

The task is simple, make two sets of the XT60 -to- Battery Terminal Connector. One with a Male one and the other with a Female XT60 connector. Pics to clarify.

Fix the other set to your car (or scooter ) battery terminals. I fixed in scooter and routed it to the storage compartment for easy access. Shrink wrap/zip tie the cables together along the length as needed so that they do not move around. I made a small hole to let the cable into the compartment. Missed taking the battery terminal connected pic (will request mods to attach later when I access the battery in the future).

That is it. Just pop up the seat (hood in your car) and connect it to charge multiple vehicles as needed. Just add one set for each vehicle, making sure that all vehicles must use the same connector end (Male or Female) while the C7 attached is the opposite end. XT60 can be bought individually by all Males or all Females as needed.

Significant Pointers:

• Can use any such easily available connector pairs, e.g. XT90 or other.
• The connector has +ve and -ve markings to make it easier. I used blue wire for the negative and red for the positive.
• Connectors already soldered with wire are also available in case you want to skip soldering. Simple connect or crimp will ease the job.
• The battery Terminal ring that I used was perfect for the 12V battery in Wego. Do check for size if your car battery has bigger terminal bolts. I went with the ring size in the C7 kit assuming this would work.
• This is not waterproof at the connectors without a cap. One can choose a waterproof connector set, if available.

To reduce risk, I kept the connector with the cavity attached to C7 clamps while the one in the scooter would not accumulate water. Additionally, I used a USB-A Terminal cap to mould as a cap in the scooter.

That's all folks, hope it helps since Bosch did not make this part available to buy for users with multiple vehicles to charge.

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